Which of the following skin derivatives is incorrectly matched with the organism on which it is found?
A. birds - feathers
B. mammals - hair and nails
C. fishes - bony scales
D. amphibians - epidermal scales
Answer: D
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. Killifish and pike-cichlids raised in natural
conditions will
a. control the size of the guppies that live with them. b. function as predators to guppies. c. determine the growth rate of guppies. d. control the evolution of size and color of the guppies. e. do all of these.
An organism that is eukaryotic is by definition:a
is a protist b. is unicellular c. possesses a nucleus d. possesses organ systems e. belongs to domain Bacteria
The body uses atoms in different ways to accomplish different tasks. For example, one portion of the body's calcium supply strengthens bones, whereas another portion combines with proteins to stimulate blood clotting after tissue injury. Which of the
following statements provides the most logical chemical explanation of calcium's ability to perform such different functions? A) The bone contains calcium salts, which are less reactive than the calcium ions found in the blood. B) The calcium in blood is a more reactive form of the atom and therefore has fewer protons than the calcium in bone. C) There are many different isotopes of calcium, and the most reactive isotope is found in the bone. D) The calcium in blood has a lighter atomic mass than the calcium in bone and is in a more reactive form.
Speculate on the benefits that antibiotic-producing bacteria may gain from engaging in a mutualistic relation-ship with leaf cutter ants
a. They are selected for producing antibiotics. b. The bacteria are actively transmitted by the ants. c. The ants control the amount of food that the bacteria can obtain. d. There don't have to be benefits for the bacteria for the ant-bacteria relationship to persist.