The individuals that disperse as a response to high population density are
A) mostly the younger members of the population.
B) more likely to survive.
C) mostly females.
D) usually superior competitors.
A
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The current rate of extinctions is about ____
times faster than normal.
a. 10 b. 100 c. 1000 d. 100, 000 e. 1, 000, 000
In angiosperms, but not conifers, pollen grains can form pollen tubes
Indicate whether the statement is true or false
A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid influences the movement of potassium ions out of the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
This figure shows horizontal gene transfer and the early evolution of life. By this diagram, order the following events:
A. Mitochondrial horizontal gene transfer B. Chloroplast horizontal gene transfer C. Single-cell eukaryotes lacking mitochondria break off from all other eukaryotes D. Plants and algae separate from animals and fungi E. Fungi separate from animals What will be an ideal response?