What caused the Devonian mass extinction?

a meteorite

global cooling

humans

none of the above

The activity of two enzymes, pepsin and trypsin, are shown here. These are two enzymes involved in the digestion of food in the stomach and small intestine. At which pH would the activity of both enzymes have the same catalyzing rate? Submit

A diseased cell is no longer able to produce proteins. Which cell structure is most likely malfunctioning?

Not everyone can travel to a remote area of the world to protect a rare habitat, but there are choices each of us can make each day to reduce habitat destruction and slow the rate of species extinction.

Describe what would happen to people who lost their mitochondria and explain why it would happen. Are there any "backup systems" available in this case; and would it be enough to sustain the organism?

What are the effects of regular exercise, especially aerobic activities, on the ots?

What is the primary function of the juxtaglomerular complex?

Which is an example of how stem cells are currently being used

Describe the type of evidence that scientists used for classifying organisms before they were able to sequence dna

Which of the following is true for DNA but not RNA? Release of PPi from the monomer provides the energy for polymerization. It has 4 different bases. It has secondary structure. None of the above; all are true for both DNA and RNA

What are two important things we use gymnosperms for?