In a bell-shaped curve, the x-axis (horizontal direction) of the graph represents which of the following?
A. The value of a particular characteristic; characteristics of an organism can include such traits as size and color.
B. The number of individuals
C. Time
Ans: A. The value of a particular characteristic; characteristics of an organism can include such traits as size and color.
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The last common ancestor of all bilaterians is thought to have had four Hox genes. Most extant cnidarians have two Hox genes, except Nematostella (of ?-catenin fame), which has three Hox genes. On the basis of these observations, some have proposed that the ancestral cnidarians were originally bilateral and, in stages, lost Hox genes from their genomes. If true, this would mean that _____.
A) the Radiata should be a true clade B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral trait C) Hox genes play little actual role in coding for an animal's "body plan" D) the Cnidaria may someday replace porifera as the basal bilaterians B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral
How is the timing of gamete formation in females different than that in males?
What will be an ideal response?
The atomic number refers to the
a. mass of an atom. b. number of protons in an atom. c. number of both protons and neutrons in an atom. d. number of neutrons in an atom. e. number of electrons in an atom.
The following belong together except which one?
A) microtubule B) microvilli C) aid in DNA movement D) comprise an internal skeleton