21. In what ways are lungs and gills similar? A. Both are used for circulating blood through the body.
B. They both are used in animal mating behavior.
C. Both are organs animals use to exchange oxygen & carbon dioxide.
D. None of the above.

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

What is the name for a substance formed in a chemical reaction

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.