When you collect a sand dollar on the beach, you are looking at the shell of an echinoderm consisting
of ossicles formed from calcium carbonate crystals.
Indicate whether the statement is true or false.
T
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A decomposer
a. is exemplified by a fungus. b. is the same as a parasite. c. feeds on living organic material. d. feeds on primary consumers only.
The nervous system develops enough to permit reflex actions during which period of development?
A. fetal, months 3-4 B. embryonic, weeks 2-3 C. embryonic, weeks 4-5 D. embryonic, weeks 6-8 E. pre-embryonic
The so-called robust australopithecines are:a
the earliest members of the genus Australopithecus. b. the line that gave rise to the genus Homo. c. the hominids that developed from Ardipithecus. d. a dead-end branch in hominid evolution. e. an extinct line of hominoids that existed about 6?7 million years ago.
What would be revealed in a comparison of mitosis and cytokinesis in animal cells and plant cells?
a. A cleavage furrow is initiated in animal cells, while a cell plate begins to form in plant cells during telophase. b. The nuclear envelope disintegrates in prophase in animal cells, but remains intact in plant cells. c. Sister chromatids are identical in animal cells, but they differ from one another in plants. d. In animal cells, chromosomes do not become attached to the spindle until anaphase, whereas chromosom