The reptile group most closely related to the birds is
the
a. turtles.
b. snakes.
c. lizards.
d. tuataras.
e. crocodilians.
Answer: e
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Megaspores produce ____
a. female gametophytes b. pollen grains c. sporophytes d. male gametophytes e. diploid tissue
The eastern meadowlark and the western meadowlark are two bird species that look very similar to each other. Why do biologists not consider them the same species?
A) Species are not determined by appearance but by their ability to interbreed naturally. B) The two species do not live in the same habitat and thus do not interbreed in nature. C) The two species experience the reproductive barrier of habitat isolation. D) All of the above are correct.
The organization of afferent information in the spinal cord is arranged based on which of the following?
a. Sensory modality b. Somatotopic c. Medial-lateral rule d. Proximal to distal
Homo erectus was a very successful species. Describe the traits of this human ancestor.
What will be an ideal response?