When a virus invades a host the most common threat is
a. production of viral fluids in the bloodstream.
b. fermentation of acids in the digestive system.
c. destruction of cells by viral reproduction.
d. stimulation of muscle tone in the heart.

Covalent bonds are formed between metals and boiling points true or false

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.