Which hypothesis states that life developed from nonliving matter?
a. abiotic evolution
b. natural selection
c. organic evolution
d. chemical evolution
e. inorganic evolution
d
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Which describes the conditions of early Earth's surface? a. Molten rock that spewed gases
b. Barren desert. c. Covered with tropical rainforests. d. Completely covered with oceans. e. Covered with an ice sheet several meters thick.
Which of the following is one of Chargaff’s
rules about DNA structure?
a. phosphate groups are connected to sugars by covalent bonds b. base pairs connect to each other by hydrogen bonds c. the amounts of adenine and thymine are the same as are the amounts of cytosine and guanine d. the DNA molecule forms into a double helix e. the strands in a DNA molecule run in opposite directions
The rapid growth of the human population still seen today began in the
A) 1200s. B) 1400s. C) 1700s. D) 1800s. E) 1900s.
The cells of cnidarians use relatively little energy, so their demand for oxygen is quite low. They deliver oxygen to their internal cells by pumping water into and out of a central chamber called the ________
Fill in the blank(s) with correct word