What is a distinct characteristic of asexual reproduction?
a. fusion of egg and sperm
b. a cell splitting into identical halves
c. genes contributed by two parents
d. high degree of genetic variation
e. formation of a fertilized egg
b
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Which is a likely biotic factor limiting songbird distribution in Hawaii to alpine habitats?
A) temperature B) oxygen content C) moisture D) insects causing fatal diseases in songbirds at lower altitudes
The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
____ is composed of dense connective tissue
a. Adipose b. Blood c. Bone d. Cartilage e. A tendon
What is an advantage of the economy of scale?
a. division of labor c. sexual reproduction b. ability to eat more food d. multicellularity