Four of the five answers below are principal characteristics of all chordates. Select the exception
a. post-anal tail
b. bony vertebra
c. notochord
d. dorsal nerve cord
e. pharyngeal gill slits
b
You might also like to view...
Melanocytes ultimately arise from
A. the endoderm. B. the mesoderm. C. the ectoderm. D. the notochord. E. the neural tube.
Which of the following microbes are most commonly the causative agent in healthcare-associated infections?
a. Hepatitis B viruses b. Gram-negative intestinal biota c. Acid-fast mycobacterium d. Gram-positive cocci
The Hawthorne and apple maggot flies appear to have become reproductively isolated from each other largely becausethey:a
have different mating behaviors. b. mate at different times of the day. c. have adapted to two different hosts. d. occupy different parts of the habitat. e. do not share the same reproductive organs.
Tropical rain forests are near the equator; they stay warm all year and have high annual precipitation. Northern coniferous forests have four seasons and most of the precipitation falls during winter and spring
Which of these ecosystems would you expect to be more productive? Explain why.