Why people shouldn't be sent to Mars

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what

What is one affect on the australian environment due to the introduction of non-native european rabbits