The species extinctions taking place today are being caused by ____ activities
a. human
b. volcanic
c. plate tectonic
d. extraterrestrial
e. geothermal
ANSWER: a
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Terrestrial vertebrates and some fish evolved a form of fertilization in which the male gametes are introduced into the female reproductive tract. What is this called?
A. synchronous fertilization B. external fertilization C. internal fertilization D. asexual fertilization
Wilting of a plant occurs
a. if the plant is placed in an isotonic solution. b. if there is a rise in turgor pressure. c. as a result of facilitated diffusion. d. if the plant is placed in a hypertonic solution. e. if the plant is placed in a hypotonic solution
What are the important parts of the microscope?
What will be an ideal response?
What cell structure is composed of microtubules and is responsible for organizing and sorting the chromosomes during cell division?
What will be an ideal response?