Some frogs, when sitting, can absorb all the oxygen they need through the skin. only when they move do they start to breathe. explain these observations.

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.

Amap's orientation is typically determined by an