How long ago do scientists believe the continents formed Pangaea?

about 135 million years ago

about 180 million years ago

about 300 million years ago

about 4.5 billion years ago

What would happen if a disease killed off the top level of an ecosystem?

This occurs to bodies of rock when one body of rock moves relative to another.

Growth and repair involve primarily what type of reactions?1. catabolic2. It depends on which body or cell part is growing or repairing. 3. anabolic

Definition of Homeostastis

If the percentage of thymine is 30% what would the percentage of cytosine be

When a cell is not dividing it is said to be resting?

Where in the cell are ribosomes made?

Both external and organization factors shape internal pay structures. a. True b. False

Which of the following describes the solar radiation absorbed by and radiated from earth?

Mutations in DNA are usually caused by chemical or radiation damage to DNA molecules, followed by imperfect repair of the damage. Immediately after this kind of imperfect repair, there may be a mismatched base pair in the DNA.