Modern invertebrates first appear in the fossil record during the
A) Cambrian period.
B) Silurian period.
C) Precambrian era.
D) cyanobacteria.
E) Devonian period.
C
You might also like to view...
In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ___________ gene.
A. pair-rule B. gap C. maternal effect D. segment-polarity E. gap or segment-polarity
The movement of water across a membrane in response to a gradient of solute concentration is called:
a. salinity. b. osmosis. c. solubility. d. diffusion. e. pressure.
Which of the following is not an assumption of the Hardy-Weinberg principle?
a. no mutation b. no migration c. small population size d. random mating e. no selection
To which group of plants are insect pollinators most important?
A) gymnosperms B) angiosperms C) mosses D) ferns