There are currently many similar-looking but different species on either side of the Isthmus of Panama. They most likely resulted from
A) allopatric speciation.
B) random mutations.
C) hybridization.
D) sympatric speciation.
E) temporal isolation.
A
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When a mixture of debris from killed virulent bacteria and living non-virulent bacteria are injected into mice:
A. the mice are killed because the virulent bacteria are revived. B. the mice survive because none of the living bacteria are virulent. C. the mice survive for a period of a few weeks and then die from an unrelated illness. D. half the mice are killed and the other half survive. E. the mice are killed because the non- virulent bacteria are transformed into virulent bacteria.
If a normal diploid germ cell in a bird has eight chromosomes, then ______
a. there are eight homologous pairs of chromosomes per diploid germ cell b. there are eight chromatids per diploid germ cell after DNA replication c. there are four chromosomes per cell after the first meiotic division and cytokinesis d. there are eight chromosomes in the sperm cells made from this diploid germ cell e. there are eight copies of each chromosome in this diploid germ cell
Pharyngeal arches will become all of the following EXCEPT
a. the face. b. the neck. c. the mouth. d. structures associated with the head region. e. lower stomach.
The process by which one species gives rise to multiple species that exploit different features of the environment is called ________
Fill in the blank(s) with correct word