The first humans appeared in the fossil record in the _____

a. paleocene
b. eocene
c. oligocene
d. miocene
e. pleistocene


Ans: e. pleistocene

Biology & Microbiology

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Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by _____.

A) habitat isolation B) temporal isolation C) gametic isolation D) behavioral isolation E) isolation

Biology & Microbiology

Which of the following plants are capable of

secondary growth?

a. ferns b. horsetails c. club mosses d. conifers e. liverworts

Biology & Microbiology

Which discovery was determined about DNA from x-ray diffraction data?

a. DNA is uniform in length. b. DNA is short and narrow. c. DNA has a repeating pattern. d. DNA molecules are flat. e. DNA molecules are round.

Biology & Microbiology

Peptidoglycan is a compound in ____

a. bacterial flagella b. bacterial cell walls c. archaean cell walls d. archaean flagella e. eukaryote cell walls

Biology & Microbiology