3. Which of the following are adaptations for flight in birds? 1. large heart 2. light-weight bones 3. air sacs a. 1 only
b. 1 and 2
c. 2 only
d. 1, 2, and 3

Photosynthesis converts light energy to chemical energy. which molecules are the end product of this transformation of energy in this reaction?

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species