________ is the maintenance by an animal of a relatively constant internal environment in a varying external environment
Fill in the blank(s) with correct word
Homeostasis
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Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers. B. acids. C. water. D. salts. E. hydrogen.
_____________ were the first living things to convert Oxyen (O2) to Carbon dioxide (CO2) ? a process called respiration?
Fill in the blank(s) with the appropriate word(s).
E.coli synthesizing K and B in the large intestine would be an example of which type of symbiosis?
A) antagonism B) commensalism C) parasitism D) mutualism
Unlike an anion, a cation has a(n) _____.
A) negative charge B) positive charge C) neutral charge D) electric charge