Which answer a b c or d.

Answer:

d.

Explanation:

The independent variable in an experiment is the variable that is manipulated to test a hypothesis. In this case, that is caffeine. In order to study the effects, they have to give different amounts to spiders

The independent variable in an experiment testing if caffeine affects the way common house spiders build webs is the amount of caffeine the house spiders receive. The correct option is b.

In science and research, a variable is any factor or condition that can be measured, controlled, or manipulated.

The independent variable is the variable that the researcher manipulates or changes in order to observe its effect on the dependent variable.

In this case, the researcher is interested in the effect of caffeine on the way house spiders build webs, so the amount of caffeine that the spiders receive is the independent variable.

The other options, such as the number of house spiders, the amount of food, or the body mass of the spiders, are not being intentionally manipulated in this experiment and therefore are not the independent variable.

Thus, the correct option is b.

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Go out and do your thing.

Answer:

J) Second Law of Energy

Explanation:

second law of thermodynamics. Scientific law stating that whenever energy is transformed from one type to another in a physical or chemical change, the result is a lower-quality or less usable energy.

Answer:

because It loses leaves so that it can keep all of the nutrients and water to the ruts and steam

Explanation:

It can always grow more leaves

Answer:

yh that's species ..,....

Answer:

Species

Explanation:

                                Taxonomical Hierarchy

                                          Kingdom

                       =============================

                                    Phylum/Division

                       ==============================

                                            Class

                       ==============================

                                            Order

                       ==============================

                                           Family

                       ==============================

                                           Genus

                       ===============================

                                          Species

As species are the most detailed category, that is the level of classification they must be in to be able to reproduce.

Answer:

A congenital heart defect (CHD) is a heart problem that a baby has at birth. It is caused by abnormal formation of the heart during growth in the womb. In most cases, when a baby is born with a congenital heart defect, there is no known reason for it. Some types of congenital heart defects can be linked to an abnormality in the number of a baby’s chromosomes. They may be linked to single gene defects. Or they may be linked to environmental factors. In most cases, there is no clear cause that can be found for the heart defect. They are often thought to be caused by many factors. The factors are usually both genes and the environment. This means that genes from both parents plus unknown environmental factors lead to the problem.

Explanation:

Answer:

I think it's option C. Organic

Answer: If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angel as it hit the surface

Explanation:

Soil is formed by the weathering of rocks which takes place over millions of years. Hence, soil formation is a slow process.

Soil formation takes place in different layers namely topsoil, subsoil, partly weathered rock and parent rock or bedrock.

The topsoil is rich in humus and supports all types of vegetation. Subsoil consists of sand, silt, clay and holds moisture.

Answer:

Soil minerals form the basis of soil. They are produced from rocks (parent material) through the processes of weathering and natural erosion. Water, wind, temperature change, gravity, chemical interaction, living organisms and pressure differences all help break down parent material.

Explanation:

hope it helps!!!

The nuclear power is a technology, providing 11 percent of electricity globally. This provides only one-fifth of America's electricity, and there are currently only five reactors under construction.

The use of nuclear reaction to produce electricity is called as nuclear power.

It can be done either by nuclear fission, decay or fusion reactions mainly by uranium and plutonium.

As America has only 5 reactors under construction recently which provides one-fifth of America's electricity.

Thus, the given statement is false.

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Answer: acute lymphoid leukemia

Explanation: Acute lymphoblastic leukemia is the most common childhood cancer. It occurs when a bone marrow cell develops errors in its DNA.

Symptoms may include enlarged lymph nodes, bruising, fever, bone pain, bleeding from the gums, and frequent infections.

Tropical, Temperate, and Polar.

Answer:

mutations can change a protein due to the mistake in the copied gene sequences

D. strain

would be thhe anwer

Answer:

D

Explanation:

They strain simply because these massive rocks are made up of obsidian mostly which is nearly impossible to break!

What causes the strain --

Elastic deformation is the dominant form of deformation at shallow depths in the crust and lithosphere because both the temperature and pressure are low.

Answer:

D

Explanation:

It can't be electrical because its a huge animal

Answer:

Each level in the food chain is called a trophic level.The different trophic levels are primary producers, primary consumers, secondary consumers, tertiary consumers and quaternaty consumers.

The  animal that is native to a different part of the world than the other two is the penguin.

The penguin is one of those birds that do not fly. They are usually found around the southern hemisphere. It is one of the animal that is adapted to living in the sea.

The  animal that is native to a different part of the world than the other two is the penguin.

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Answer:

The capsid surrounds the virus and is composed of a finite number of protein subunits known as capsomeres, which usually associate with, or are found close to, the virion nucleic acid. I hope this helps and god bless

Explanation:

Answer:

Birth rate, death rate, and fertility rate.

The molecules that are unable to pass through the phospholipid bilayer is sugar .

Phospholipid bilayer refer to a two thin layers which consists of hydrophobic head and hydrophilic tail which allow allow the inflow or outflow of gases and smaller substances in cells.

Therefore, The molecules that are unable to pass through the phospholipid bilayer is sugar .

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Answer:

upload the picture or tell me which order the animals and what they are in and i will be able to anwser within the comment's

Explanation:

Answer:

absence of that solute from the urine

Explanation:

A protein transporter is involved in the transportation of the ions and the molecules. If a membrane protein transporter gets totally saturated in the renal tubules, then that solute will appear in the urine.

Transport proteins are the transporters that move the molecules, ions, and macromolecules in and out of the cell. They carry the molecules and substances across the biological membrane and allow their diffusion.

If a transport protein saturates a solute totally in the renal tubules, then that solute will get secreted in the urine as they are easily soluble in the water and the fluid of the excretion system.

Therefore, the solute will get excreted in the urine.

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Succession.

- Primary succession starts from square one, usually with bacteria being the first organisms to colonize a barren rock surface (for example, regrowth after a volcanic eruption)

- Secondary succession redevelops an area after a more minor disturbance, with plants often able to return sooner (for example, a forest regrowing after a forest fire)

Answer:

D. Succession.

- Primary succession starts from square one, usually with bacteria being the first organisms to colonize a barren rock surface (for example, regrowth after a volcanic eruption)

- Secondary succession redevelops an area after a more minor disturbance, with plants often able to return sooner (for example, a forest regrowing after a forest fire)

Explanation:

The purpose of reproductive cells is to pass a copy of a cell's genes to cells in the next generation. The purpose of somatic cells is to pass the parents' genes onto the next generation.

Reproductive cells are specialized cells involved in the process of sexual reproduction. In humans and many other organisms, reproductive cells include sperm cells in males and egg cells (or ova) in females. These cells are produced through a unique cell division process called meiosis, which reduces the number of chromosomes in half to create haploid cells.

Somatic cells make up the majority of an organism's body and are involved in various functions, such as growth, repair, and maintaining bodily functions. Unlike reproductive cells, somatic cells are diploid, containing two sets of chromosomes—one inherited from each parent. While somatic cells do not directly pass their genes to the next generation, they play a crucial

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The frequency of tusklessness is increasing in the African elephant population because evolition which occurs by means of natural selection selects elephants that are tuskless for survival.

Natural selection is a process by which organisms with featuresthat make them best suited for survival in their environment are selected for survival.

These traits are present in these organisms as a result of evolution.

The traits that are naturally selected enhances the ability of the organism to survive.

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Answer:

Cars became more energy efficient because of the oil crisis in 1973.

Explanation:

It forced manufacturers to focus on fuel economy, which made gallon numbers rise in the late 1970s and early 1980s.

Hope this helps: )