During the Pleistocene era, many large mammal species went extinct. Their permanent disappearance occurred in a short period of time when humans were expanding across North America. In this situation, how do many scientists view humans?
A) as a threatened species
B) as a density-independent factor
C) as an invasive species
D) as a biological control agent
C
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Oaks, birches and corn produce both staminate and pistillate flowers on the same plant. What term describes this type of plant?
A. monoecious B. dioecious C. hermaphroditic D. complete E. determinant
Select the correct pair of statements about FSH and LH function.
A. In males, FSH stimulates spermatogenesis and LH stimulates Leydig cells to secrete testosterone. In females, FSH stimulates growth of follicles and LH stimulates ovulation and development of the corpus luteum. B. In males, FSH stimulates spermatogenesis and LH stimulates Leydig cells to secrete testosterone. In females, FSH stimulates ovulation and development of the corpus luteum and LH stimulates growth of follicles. C. In males, FSH stimulates Leydig cells to secrete testosterone and LH stimulates spermatogenesis. In females, FSH stimulates growth of follicles and LH stimulates ovulation and development of the corpus luteum. D. In males, FSH stimulates Leydig cells to secrete testosterone and LH stimulates spermatogenesis. In females, FSH stimulates ovulation and development of the corpus luteum and LH stimulates growth of follicles.
The diagram below shows a region near the center of a long arm of a chromosome. Assume that in the diagram below, every vertical hatch mark is 1 map unit from the next vertical hatch mark. The dashed double line represents an inversion
If you crossed this heterozygous individual with a normal homozygous recessive individual, and produced 1000 live offspring, how many would you expect to be Aa dd?
Atmospheric carbon dioxide concentrations in a forest are greater during the day than during the night
Indicate whether the statement is true or false