The evolution of new species
A. always takes millions of years.
B. can take place in one generation.
C. is a rare event over hundreds of millions of years.
D. is not occurring today.
B. can take place in one generation.
You might also like to view...
The steady charge difference across the plasma membrane is called the
a. action potential. b. energy potential. c. electrolyte potential. d. resting membrane potential. e. kinetic potential.
The analysis of parent—offspring conflict in birds has generated some interesting observations. For example, researchers hypothesized that chicks should beg to be fed by their parents more loudly when their nestmates are less closely related. (See Figure A, where Of = optimal parental investment where the lost siblings are full sibs, and Oh for an offspring whose lost siblings are half sibs.)
Do the data collected bear this out (Figure B)? Figure A Figure B A) Yes, species that evolve extra-pair parentage also tend to evolve louder begging chicks. B) No, the genetic relatedness of the chicks has nothing to do with the level of begging by chicks. C) The data are inconclusive; no conclusion can be formulated.
The most common limit to plant growth is the lack of which nutrient?
a. carbon b. hydrogen c. oxygen d. nitrogen
All of the following play a role in the development of cancer EXCEPT
A) mutations. B) a large supply of Cdks stimulating cell division. C) uncontrolled cell division. D) inhibition of Cdk and blocking of DNA replication.