Some scientists believe that any Martian organisms would most closely resemble members of the Archaea on Earth. What is the basis for their thinking?
What will be an ideal response?
Members of the Archaea inhabit some of the most extreme environments on the planet. These are similar to the environments present on Earth soon after its formation. This suggests that the Archaea organisms are very ancient in origin. It is thought that any Martian environments are also very harsh and extreme, much like those inhabited by Archaea organisms today.
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Which animal of the Cambrian period is also one of the first animals to exhibit a sense of vision?
a. Cyclomedusa b. trilobite c. Dickinsonia d. Spriggina
The chromatids detach from one another and become visibly separate chromosomes during
A) anaphase. B) metaphase. C) prophase. D) interphase. E) telophase.
Refer to the paragraph on the effects of estrogens in the environment. What is the significance of using the concentrations of 5, 25, and 100 ng/l of 17?-estradiol for the dose in this experiment?
A) These concentrations are similar to those found in many animals. B) These concentrations are found in the environment. C) These concentrations are effective, yet not lethal to the fish. D) These concentrations are standard in toxicology assays.
A gene pool refers to all of the alleles found in _________.
a. an individual b. parents and their youngsters c. a species d. all species of living organisms