The atomic number of an atom is determined by the number of
1.electrons
2.neutrons
3.protons
4.isotopes
3
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Why is it important to have a slow block to polyspermy?
A. The fast block doesn't work well. B. The slow block creates a permanent barrier. C. The fast block is actually slower than the slow block. D. It prohibits the acrosomal reaction. E. All of the choices are correct.
The manta ray feeds on:
a. larger fish. b. surface and diving birds. c. squid. d. small fish and plankton. e. other rays.
A double-ring nitrogenous base found in DNA and RNA
What will be an ideal response?
Which wastewater treatment process produces BOD-containing effluent used for irrigation?
A) anaerobic sludge digestion B) primary sewage treatment C) secondary sewage treatment D) tertiary sewage treatment E) water treatment