Use the drop-down menus to choose the type of investigation that best completes each statement.

investigations show relationships that do not always indicate cause-and-effect relationships.

investigations cannot perfectly reproduce the conditions of the natural world.

investigations often are not repeatable because the results may change over time.

Comparative

Descriptive

Experimental
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Comparative- investigations show relationships that do not always indicate cause-and-effect relationships.

Experimental- investigations cannot perfectly reproduce the conditions of the natural world.

Descriptive- investigations often are not repeatable because the results may change over time.

Explanation: I just did this on edge

1) Investigations show relationships that do not always indicate cause-and-effect relationships = comparative

2) Investigations cannot perfectly reproduce the conditions of the natural world = experimental

3) Investigations often are not repeatable because the results may change over time = descriptive

Explanation:

a) pacific plate is correct

hope this !

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms