Why are certain amino acids called essential amino acids? a. because they are available in abundance b. because they are not manufactured by the body c. because they can form bonds with any molecule d. because they are the most stable among all the amino acids e. because they are needed for the formation of all biomolecules?

“in 1492 columbus sailed the ocean blue” is an example of: a)explicit memory b) procedural memory c) semantic memory d)episodic memory

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

Which of the following is a common response to cell signaling?