Coral reefs are
A) shells of Mollusca that have been converted to rock by geological processes.
B) hard external skeletons secreted by coral animals (Cnidaria).
C) marine rocks that often are used as attachment places by Cnidaria.
D) hardened sugars that are secreted by algae.
Answer: B
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What is the difference between cross- and self-fertilization?
A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant. B) In cross-fertilization the pollen from one plant is used to fertilize the egg from the same plant. C) In self-fertilization the pollen from one plant is used to fertilize the egg from another plant. D) In cross-fertilization insects are used to pollinate the plants, whereas in self-fertilization the investigator pollinates the plants.
Maintaining a constant internal environment for all biological process is known as what?
a. regulation b. homeostasis c. adaptation d. energy usage
Based upon today’s molecular evidence, Homo sapiens appear to have originated from:a
Europe. b. Indonesia. c. East Africa. d. South Africa. e. South America.
During cell division, the sorting process that ensures transmission of a full set of chromosomes to each daughter cell is called?
What will be an ideal response?