Which factor causes the shapes of saturated and unsaturated fatty acids to differ? a. number of oxygen atoms attached to each carbon atom b. number of single covalent bonds between carbon atoms c. number of double covalent bonds between carbon atoms d. number of carbon atoms in the carbon chain

The answer is option C. Number of double covalent bonds between carbon atoms is responsible for causing different shapes of saturated and unsaturated fatty acids. The double covalent bond causes kink in the unsaturated fatty acids because of which their stacking is disrupted and they become loosely packed. The problem with double covalent bond is that unlike single covalent bond it can't rotate and has almost cis-configuration. This is also the reason behind their liquidity at room temperature.

The correct answer would be "Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again".

Hybrid seeds are produced by cross-pollination in order to get the best properties of both the breed such as disease resistance, tolerance to environmental stress, high yield etc.

Removal of the statement "Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again" least affect the reliability of the given stanza.

If one saves the hybrid seed then there are fewer chances to get the same plant again, however, the chances are not nil. They might loose some characters or might gain new favorable characters.