The body wall of cnidarians and ctenophores consist of:

a. three tissue layers.
b. a single epidermal layer.
c. loosely organized cells.
d. two epidermal layers with scattered mesophyll cells in between.
e. inner and outer cell layers separated by a jelly-like mesoglea.


e

Biology & Microbiology

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Which of the following pairs is correctly matched?

A. broad ligaments - help support the uterus B. cervix - lined with rugae C. basal layer - layer of endometrium closest to uterine cavity D. perimetrium - muscular coat of uterus E. endometrium - connective tissue layer

Biology & Microbiology

Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:

A. allopatric speciation by dispersal. B. allopatric speciation by vicariance. C. peripatric speciation by vicariance. D. sympatric speciation by dispersal. E. sympatric speciation by vicariance.

Biology & Microbiology

Atoms with atomic numbers between lithium and neon have two energy levels

Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following techniques was used to produce Dolly, the first mammal to be cloned?

a. trangenic modification b. transformation c. enucleation d. fermentation

Biology & Microbiology