Which chemical in tobacco smoke binds to hemoglobin, causing red blood cells to carry less than their normal load of oxygen?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

The transport tubes for food coming down the plants are called?