D) The AV valves are supported by chordae tendineae so that they do not blow back up into the atria during ventricular contraction.
Biotechnology can be used to transform bacteria so they are able to make human proteins, such as insulin. It can also be used to create transgenic crops, such as crops that yield more food or resist insect pests. (I copied this off the web so just paraphrase)
Answer:
B. air pressure increases
Explanation:
Think of it like this, the lower you are, the more air is above you. The higher ur elevation, the less air above you. I hope this can help!
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You point to someone specific and shout, "you call 911!" Then start infant CPR.
(If you just yell call 911, many times everyone waits for someone else to do it. It is best to assign someone specifically to do it.)
Hope that helps.
