The temperature range within which an organism can survive is known as:
Ans: cardinal temperature
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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?
The essence of meiosis is that
a. one gamete receives the maternal chromosomes, and the other gamete receives the paternal chromosomes. b. diploid gametes are formed. c. gametes are formed after one cell division. d. diploid spores are formed. e. haploid gametes are formed.
The critical hurdle with measuring treatment effects is that:
A. our subjects cannot be both untreated and treated at the same time. B. it's always equal to the effect of the treatment on the treated. C. it's hard to have a truly random treatment assignment. D. we have selection bias.
Which cell structure is correctly paired with its primary function?
A. ribosome - protein synthesis B. mitochondrion - movement C. vacuole - cell division D. nucleus - storage of nutrients