Unlike perennials, annuals
a. are limited to life in a single year.
b. are always woody plants.
c. live for many years.
d. grow for two years.

What are two reasons for why a species might disappear from the fossil record?

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere