Most species produce large numbers of offspring by sexual reproduction. This is important to the theory of natural selection because
A. each individual is unique and this diversity allows selecting agents to operate.
B. selecting agents often lead to the death of large numbers of offspring.
C. the diversity shown in the offspring makes it highly likely that some of them will be able to reproduce successfully.
D. All of the choices are correct.
D. All of the choices are correct.
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Which of the following cell types has NO nucleus?
A) erythrocytes B) lymphocytes C) phagocyte D) All of these cells lack a nucleus.
Members of the ____ Lophotrochozoan phylum include earthworms, bristle worms, and leeches
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
A new operon is discovered in a bacterium. The control of this operon is affected by a protein that is
made by another gene, and is made in an active form that binds to the DNA near the operon to prevent transcription. This is an example of __________ control. a. positive b. negative c. activational d. repressing e. inducing
Of the ________ electrons released in Nitrosomonas europaea nitrification, ________ must return to AMO to continue ammonia oxidation, while ________ can be used either as reductants for biosynthesis or be donated to the electron transport chain to reduce the terminal electron acceptor, oxygen.
Fill in the blank(s) with the appropriate word(s).