What is the best definition of total fertility rate?

A. the average number of children born per woman during her lifetime
B. the frequency of children dying in infancy
C. the pregnancy rate in adult women
D. the rate of fertility that keeps the size of a population stable
E. the rate of fertility that leads to a decline in population


Ans: A. the average number of children born per woman during her lifetime

Biology & Microbiology

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What key words does the question contain and what do they mean?

What will be an ideal response?

Biology & Microbiology

Which gamete genotypes are expected to contribute to viable offspring when an individual is heterozygous for a pericentric inversion and crossing-over occurs as shown in the diagram? (The ? symbol represents a centromere.)(Select all that apply.)



A) ? A B C D E
B) ? A B C d a ?
C) ? a d c b e
D) e b c D E
E) ? A B C d e
F) A B C ? d a
G) e b c ? D E
H) A B C ? D E
J) a d ? c b e

Biology & Microbiology

Which of the following is a lophotrochozoan protostome?

a. arthropods b. cnidarians c. mollusks d. chordates e. nematodes

Biology & Microbiology

Once they are identified, ____ take priority in worldwide conservation efforts.

A. healthy ecosystems B. riparian zones C. hot spots D. grasslands E. forests

Biology & Microbiology