Which statement about the development of a coelom is FALSE?
a. It requires animals to have either two or three tissue layers.
b. It requires the endoderm to be covered by mesoderm.
c. It occurs in protostomes and deuterostomes.
d. It may occur by random.
e. It is a fluid-filled cavity.
a
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Which of the following lists gives the cellular processes for limb formation in correct order from first to last?
A. cell division, cell migration, cell differentiation, cell death B. cell migration, cell differentiation, cell division, cell death C. cell migration, cell division, cell differentiation, cell death D. cell division, cell differentiation, cell migration, cell death E. cell differentiation, cell migration, cell division, cell death
The embryo develops from cells of the
a. blastocyst outer layers. b. blastocyst inner cell mass. c. gastrula mesoderm. d. gastrula ectoderm. e. gastrula endoderm
When a person receives a sudden, large dose of ionizing radiation, which cells are typically destroyed?
a. immune system cells b. epithelial cells c. epithelial cells of the intestine d. red blood cells e. all of these
The fossil record shows that for many plant and animal groups, the time between speciation events
A) is usually about 50,000 years. B) varies greatly, but averages 6.5 million years. C) is usually greater than 40 million years. D) is equivalent to the length of 100 generations of a species.