A strain is
a. a subdivision within a family that has a characteristic trait or traits.
b. a subgroup within a species that has a characteristic trait or traits.
c. a group within a branch that has a characteristic trait or traits.
d. a group within a phylum that has a characteristic trait or traits.
e. a subgroup within a domain that has a characteristic trait or traits.
Answer: b. a subgroup within a species that has a characteristic trait or traits.
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A newly hatched duck adopts the first large, moving object it sees as its mother. This is an example of ________
Fill in the blank(s) with correct word
The modern term derived from the Greek root words meaning "ancient," "having existed," and "study of" is
A. anthropology. B. biogeography. C. museology. D. paleontology. E. sedimentology.
The simplest nervous system occurs among
A. platyhelminthes. B. cnidarians. C. nematodes. D. mollusks. E. sponges.
An ________ may arise when three sperm cells are involved in fertilization of a single egg
A) aneuploidy B) allotetraploid C) allotriploid D) autotetraploid E) autotriploid