Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. Kidneys that are extremely good at producing a concentrated urine
B. Body fluid concentrations that are similar to or greater than those of seawater
C. The ability to secrete salts and wastes into their intestinal contents like an insect
D. They use ammonia as their primary nitrogenous waste
E. Salt glands
E. Salt glands
You might also like to view...
The starting point for the ovarian cycle is a
a. primary oocyte arrested in meiosis I. b. primary oocyte arrested in meiosis II. c. primary oocyte having just completed meiosis I. d. secondary oocyte arrested in meiosis I. e. secondary oocyte arrested in meiosis II.
Which statement is LEAST characteristic of proteobacteria?
a. They live only inside plants. b. Some are photoautotrophs. c. Some are chemoautotrophs. d. Some are chemoheterotrophs. e. They are the most diverse group of bacteria.
Cleavage produces the
a. zygote. b. blastula. c. gastrula. d. puff. e. third germ layer.
Natural selection can be defined as ________.
A. a process in which organisms with certain inherited traits are more likely to survive and reproduce than individuals with other traits B. the production of more offspring than can survive in a given environment C. the evolution of a population of organisms D. a process in which changes in gene frequencies result from evolution