Which statement best describes vestigial structures

A. All animals have them

B. They are necessary for an organisms survival

C. They contain genetic mutations

D. They may have had an important function in the past.

What kind of stem cells can only develop into the same kind of cell as the original stem cell A. Totipotent stem cells B. Pluripotent stem cells C. Unipotent stem cells D. Multipotent stem cells

Earth is made up of four main spheres. The geosphere refers to the rocks, minerals, and natural landforms that make up Earth's surface. What do you think makes up the hydrosphere? Why is the hydrosphere important to life on Earth?

Which of the following is composed of amino acids? Vitamins Minerals Carbohydrates Proteins

Which structure in the diagram does the fungus use to reproduce sexually? A. sporangium B. spores C. hyphae D. both (A) and (B)

Explain how competition promotes resource partitioning

Can energy be transferred from animal to animal

The more stomata the more water loss?

Why does it take a long time to develop a new variety of tomato? A. Changes in traits happen gradually, over many generations. B. Many plants resist change. C. Tomatoes cannot acquire new traits. D. A species cannot change over time.

Select the one true statement. Vacuoles store nutrients, water, and waste in animal cells. Plant cells can have chloroplasts but do not have a cell wall.

Using water more effectively A. Protects the environment B. Causes the loss of natural pollution filters C. Increases with contamination D. All of the above