Around 580 million years ago, the first simple animals are seen in the fossil record. These first fossilized animals
a. had a hard protective shell protecting their bodies.
b. were photosynthetic.
c. were predominantly trilobites.
d. were all land animals.
e. were probably not related to the modern jellyfish and worms they resembled.
E
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The worldwide total fertility rate changed from
__ children per woman to ___ children per woman.
a. 2.5...6.5 b. 6.5...2.5 c. 1.5...8.5 d. 8.5...1.5 e. 3.5...4.5
Why is the biological membrane said to be selectively permeable?
What will be an ideal response?
Consider the following sentence: "The dog did not eat." Which of the following variations of this sentence is most like a frameshift mutation?
A) The did dog not eat. B) The dod idn ote at. C) The did not eat. D) The dog did dog did not eat.
Which item(s) are required for an artificial selection regime for a microbiome? Choose all that apply.
A. Whole genome sequence for host B. Variety of microbe strains in different individuals C. Variety in host phenotype D. Genetic variation of host species E. Whole genome sequences for all strains F. Method to determine which strains are present G. Method for measuring host phenotype