as a tree ages it needs to keep making more xylem and phloem cells to carry water and food how does this occur

What are two factors in the atmosphere that can change the shape of landforms?

How is sympathetic speciation similar to allopathic speciation

Write one sentence using all of the terms that shows how they are interconnected. Highlight, bold, or change the color of the terms in your sentence. Cell Nucleus Chromosome DNA Gene

Which of the following is a reason why cells divide? A. to keep demands on their DNA low. B. to mutate their DNA. C. to increase the volume of their cytoplasm. D. to become larger in size.

Benjamin is an 18-year-old college student who is 5'10" tall and weighs 170 pounds. how many kilocalories does he expend each day for basal metabolism? benjamin is an 18-year-old college student who is 5'10" tall and weighs 170 pounds.

A group of cells working together is known as what

What do amoeba proteus, dinoflagellate, and euglena viridis have in common? a. they all can move and make their own food b. they all can move and use eye spot to locate food c. they all can move and be heterotrophic d.

How is a scientific hypothesis best evaluated?

The overall population of a species decreased. What could have occurred to make this happen? The immigration rate increased, while the death rate decreased. The birth rate decreased, while the death rate increased.

Which of the following terrestrial biomes cannot be found in the United States? A: temperature deciduous forest B: tundra C: desert D: grassland/prairie