Which one of the following is a correct molecular formula?
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Name the three animal phyla that feed and respire with a lophophore
What will be an ideal response?
Nearly complete skeletal data is available from fossils of ____, an early tetrapod that differed from
fishes in part by having a neck.
a. Ichthyostega b. Anolis c. Dunkleosteus d. Eusthenopteron e. Archaeopteryx
If a man expresses an X-linked recessive trait, ____
a. all of his brothers will also express it b. his father transmitted the trait to him
c. his father carried the trait d. all of his sisters will also express it e. his mother was heterozygous or homozygous for the trait
The emergence of new infectious diseases is probably due to all of the following except
a. the need of bacteria to cause disease. b. the ability of humans to travel by air. c. changing environments (e.g., flood, drought, pollution). d. a pathogen crossing the species barrier. e. the increasing human population.