Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:
A. energetic
B. ionic
C. radioactive
D. isometric
C. radioactive
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Lymph moves throughout the lymph vessels due to ____
a. contraction of the heart b. conscious actions c. constriction of blood vessels d. dilation of blood vessels e. skeletal muscle and breathing movements
The most recent international project to assess the diversity, distribution, and abundance of marine life was called which of the following?
What will be an ideal response?
Which step in the evolution of life is the most
complex and probably occurred last? a. formation of DNA b. formation of protein-RNA systems c. formation of membrane-bound proto-cells d. spontaneous formation of organic compounds under abiotic conditions e. formation of ATP
The region of the small intestine with the lowest pH is the ________
Fill in the blank(s) with correct word