Groups of cells that share a common structure and function are considered to be
a. organs.
b. mesenteries.
c. colonies.
d. tissues.
e. organ systems.
D
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A drug exhibiting which therapeutic index value would be the safest, most effective to use on a patient?
A. 1 B. 20 C. 10 D. 0.1 E. Any choice would be equally effective.
True or false: Supercoils in DNA are induced or relaxed by enzymes called topoisomerases
A. true B. false
The Burgess Shale preserves a remarkable fossil record of:
A. delicate flowers and mushrooms from the early invasion of land plants. B. marine life during initial diversification of animals in the Cambrian Period 505 million years ago. C. plants, insects, and mammals around 50 million years ago, as the age of mammals began. D. the tracks of dinosaurs walking on land. E. molecular evidence of bacteria and other organisms.
How do we know that the atmosphere of the earth experienced an increase in O2 and became oxidizing between 2.5 and 2 billion years ago?
What will be an ideal response?