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

Microorganisms are involved in each of the following processes excepta. smog production.b. food production.c. infection.d. o2 production.e. decomposition of organic material.

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

Select the correct answer from each drop-down menu proteins are