Echinoderms _____
A) have an exoskeleton of hard calcareous plates
B) often use tube feet to move around in their environment
C) digest their food outside of the organism
D) circulate hemolymph in their water vascular system
E) are most often found in freshwater environments
Answer: B
You might also like to view...
You are looking at a sample from the top green layer of a colorful bacterial mat. Using phase contrast and fluorescence microscopy, you see evenly spaced cells in the middle of a filament that are slightly smaller than the others
The smaller cells are not fluorescent, indicating they lack photosystem II, but the rest of the filament is fluorescent. What type of filamentous bacteria are you most likely looking at? A) purple nonsulfur bacteria B) green sulfur bacteria C) Acidobacteria D) Cyanobacteria
What is the ploidy of an organism that is 7n, where n = 5?
A) 5 B) 7 C) 12 D) 35 E) 57
Which factor may result in the actual carrying capacity of our planet being lower than initially calculated?
A) The average American uses more resources than someone from another country. B) Modern food production relies on nonrenewable resources. C) NPP has been decreasing. D) The human population is growing much faster than was previously thought.
All of the following are abiotic factors, except
A. light. B. minerals. C. water. D. atmospheric gases. E. an animal carcass.