A cheetah has succeeded in catching a gazelle and has just finished feeding on the carcass. What division of the nervous system has increased in activity?
A. somatic nervous system
B. parasympathetic nervous system
C. sympathetic nervous system
D. parasymbiotic nervous system
E. cerebral cortex
B. parasympathetic nervous system
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Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____
A) convergent evolution B) a homologous structure C) natural selection D) a vestigial trait
How many years did it take for the world population to reach one billion?
a. 100,000 b. 500,00 c. 1 million d. 2 million e. 2.5 million
The genetically identical organisms that result from asexual reproduction are called
A) clones. B) seeds. C) seedlings.
A true-breeding strain of red tulips is crossed to a true-breeding strain of white tulips. All the offspring have pink flowers. When a pink-flowered plant is self-fertilized, the offspring have red, pink, and white flowers, in the ratio 1:2:1. This type
of inheritance is an example of ________. Fill in the blank(s) with correct word