About 225 million years ago, North America and South American were part of one huge landmass, Pangaea.

The two parts of meiosis are A. reduction and division. B. reduction and duplication. C. duplication and crossing over. D. reduction I and reduction II

What categorizes a chromosomal disorder as a numerical or structural chromosomal disorders

When members of the same species live in the same place, they form a (n) ?

Name 3 types of fossils and describe how they form

The Gulf of Mexico provides 72 percent of the shrimp harvested in U. S. waters. Those populations are at risk because the dead zone in the Gulf of Mexico. Which statement best described this dead zone? A.

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