Mammals are social animals. which of the following statements is correct?
a. herbivores such as zebras and dolphins live in herds.
b. adults in a herd surround and protect the young, who are most vulnerable to predators.
c. adult males in a pride hunt cooperatively, which is more efficient than hunting alone.
d. all of the above

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms