Which of the following statements about natural selection is true?
a. Natural selection causes variations to arise within a population.
b. Natural selection leads to increased likelihood of survival for certain individuals based on variation. The variation must come from outside the population.
c. All individuals within a population have an equal likelihood of survival. Survival is based on chance.
d. Natural selection results in those individuals within a population who are best-adapted surviving and producing more offspring.
e. Natural selection leads to extinction.
D
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a. plasma. b. formed elements. c. interstitial. d. extracellular matrix. e. exocrine.
Echinoderms include _______.
a) insects and crustaceans b) tapeworms and planarians c) jellyfish and sea anemones d) snails, clams, and squids e) starfish and sea urchins
For viewing which of the following would a scanning electron microscope not be the instrument of choice?
a. The complexity of T-even bacteriophages b. The helical structure of deoxyribonucleic acid (DNA) c. Human erythrocytes (red blood cells) d. E. coli bacteria
In humans, X-linked genetic diseases
a. are associated with autosomes. b. tend to be expressed more in females than males. c. only affect males. d. tend to be expressed more in males than in females.