What is the difference between covalent bonds and ionic bonds?
a) covalent bonds are formed between atoms to form molecules; ionic bonds are formed between atoms to form compounds.
b) covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms.
c) covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.
d) covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between atoms.
e) covalent bonds involve the transfer of electrons between atoms; ionic bonds involve the sharing of electrons between atoms.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

links? do you have a link? i don't see anything?