When a cold ocean current brings rich nutrients to the surface and influences the climate of the region, it is called a(n)
A. upwelling.
B. lake effect.
C. guano.
D. profundal zone.
E. monsoon.
Answer: A
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In seed plants, the transfer of immature male gametophytes to female reproductive parts is a process called ____
a. meiosis b. pollination c. fertilization d. mitosis e. sporulation
What is the difference between a primary and a secondary source?
A) A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. B) A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. C) A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D) There is no difference between primary and secondary sources.
In an adult human stem cell that has a total of 48 chromosomes, how many chromatids are present at prophase of mitosis?
A) 12 B) 24 C) 48 D) 72 E) 96
It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that ____
A) island forms are descended from mainland forms B) common environments are inhabited by the same organisms C) island forms and mainland forms have identical gene pools D) the island forms and mainland forms are converging