Which two animals listed below do NOT contain an actual circulatory system?
a. grasshopper and fish
b. grasshopper and hydra
c. hydra and fish
d. sponge and fish
e. sponge and hydra
E
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Semen contains all of the following EXCEPT
a. about 5 percent sperm by volume. b. a fast-acting clotting enzyme. c. a slow-acting enzyme that breaks down the semen clot. d. a substance that decreases the pH in the female reproductive tract. e. a substance that triggers contraction of muscles in the female reproductive tract.
Sister chromatids connect at the _____
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1.Lichens and mosses that can grow on and erode rock would be considered pioneer species. 2.All communities eventually reach the climax state, in which all components are consistent. 3.Energy is constantly being recycled within an ecosystem. 4.Raw sewage within a water ecosystem can kill fish because respiration by the microbes in the sewage reduces the concentration of oxygen within the water. 5.In a process called denitrification, bacteria convert NO – to N .
what is the terms for a flexible spiral shaped bacterium that moves through the use of an axial filament
What will be an ideal response?