What are considered to be the two most important factors that have been involved in past mass extinctions?
a. disease and parasites
b. fire and weather events
c. glaciers and earthquakes
d. environmental and biological factors
e. plate tectonics and climatic factors
d
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Four of the five answers below are explanations of why the fossil record is incomplete. Select the exception
a. very few organisms were preserved as fossils. b. organisms tend to decay before becoming a fossil. c. animals with hard parts are preserved more easily. d. geological processes may destroy fossils. e. organisms that were widely distributed would lead to less fossils.
The sliding filaments that move relative to each other during muscle contraction are ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following mathematical expressions represents the product rule, leading to the conclusion that both event X and event Y are occurring?
a. P = X2Y2 b. P = XY c. P = X + Y d. P = X2 + Y2
Immunotherapies seek to take advantage of ________ in treating cancers
A) a patient's own immune system B) a patient's own SNPs C) a patient's own cancer cells D) a patient's own genome