All humans are classified as Homo sapiens, a single species. But you know from looking around you that all people do not look or sound the same
Explain how it is possible for humans to belong to the same species yet display a wide range of physical differences.
Throughout human history, the total human population existed in many smaller subpopulations that were geographically isolated from each other. Minor mutations in those populations, coupled with sexual reproduction among members of the subpopulations, have led to subtle phenotypic differences. These differences are still evident today, although marriages between different ethnic groups or races are more common today than in earlier times in human evolution.
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Which of the following is a disadvantage of self-fertilization?
a. Producing less fit offspring b. Restricting embryo nourishment c. Reducing the number of diploid females d. Creating less adaptable offspring
The structures illustrated in the figure are found in
the a. mouth. b. esophagus. c. stomach. d. small intestine. e. colon.
The ciliary muscle
a. controls the eardrum. b. controls the shape of the lens to allow focusing. c. holds the bones of the middle ear in place. d. enables the eyeball to move so that a person may see an object without moving the head. e. is responsible for the size of the pupil in different light intensities.
To which era do these fossils belong?
A) Mesozoic B) Cenozoic C) Precambrian D) Paleozoic