Regarding the nature of natural selection, which of the following is NOT an accurate statement?
A) Populations evolve traits by natural selection that will be useful for future environmental changes.
B) Natural selection acts on the phenotypes of individuals, but evolution occurs with changes in allele frequencies in populations.
C) Natural selection can and does produce features that are less than perfect adaptations.
D) Natural selection operates as a systematic, nonprogressive mechanism.
A
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Refer to the accompanying figure. Absorption of positively charged mineral ions by the root is facilitated by the movement of:
a. clay particles into the root hair.
b. water into the root hair.
c. protons into the root hair.
d. protons out of the root hair.
e. Mg+ out of the root hair.
A paroxysmal cough is associated with Legionnaires'disease.
a. true b. false
Chromatin that contains sequences that are not transcribed in any cell type is called
a. constitutive heterochromatin. b. facultative heterochromatin. c. constitutive euchromatin. d. facultative euchromatin.
Since air pollution is visible, it is easy to determine when not to exercise.
a. true b. false