b. red algae—eukaryotes that acquired plastids by secondary endosymbiosis
Explanation:
<em>Red algae did not acquire plastids by secondary endosymbiosis and thus, option b is an incorrect pair. </em>
Red algae are eukaryotes that are red in the color not because they acquired plastids y endosymbiosis but because they produce the enzyme phycoerythrin and phycocyanin which masks the other pigments present in it.
Secondary endosymbiosis is a process by which the product of primary endosymbiosis is engulfed by another organism. Such type of process never occurred in case of red algae.
Body temperature, Environmental temperature, Body mass, Reproductive condition, Activity, Feeding, Body condition, Season. All of these would help increase it. Hope this helps. :)