Which of the following is not a postzygotic isolating mechanism?
a. Male gametes are not transferred to the female gametes.
b. Zygotes die early in embryogenesis.
c. Hybrids are inviable.
d. Hybrids are sterile.
e. Backcross hybrids are inviable.
A
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Which of these vascular tissue cells is alive but lacks a nucleus?
A. vessel element B. tracheid C. companion cell D. sieve-tube members
Two noncellular agents, smaller than viruses, are the infectious proteins called ________, and the infectious RNA strands called ________.
Fill in the blank(s) with the appropriate word(s).
Describe how syntrophy helps explain why certain enrichments yield consortia and never an individual species
What will be an ideal response?
A process in which organisms with certain inherited characteristics are more likely to survive and reproduce than individuals with other characteristics is called __________.
A. .evolutionary adaptation B. descent with modification C. natural selection D. evolution