Unlike animal-like protists, many fungus-like protists are a) decomposers b) parasites c) heterotrophic d) unicellular

a) decomposers i think im not 100% sure.

A. decomposers

The decomposers are organisms that break down the dead and decaying organisms such as plants and animals. The fungi are the primary decomposers if the litter in the ecosystem. The fungi are saprophytic organisms which feed upon the nutrients obtained after the decomposition process. They exhibit a fungal hyphae which can penetrate deep inside of soil in order to obtain the food. Protists are simple unicellular organisms, these are members of the kingdom Protista. Some of these Protists shows similarity in structure and function with animals, plants, fungi and microbes. The molds are protists which are found on feeding upon dead decaying matter like fungi. Examples are slime mold and water molds.

The correct answer is - Most killer whales congregate in the areas that are near the Arctic/Antarctic Circles.

The killer whales have a very large distribution, and they can be found in all oceans, apart from the Southern Ocean. It is noted though that the population density of the killer whales differs from place to place. The higher concentrations are found around the Arctic and Antarctic Circles, where there's cool rich waters, while in the lower latitudes they are much rarer. The reason for this probably lies in the fact that most of the animals that are considered to be the prime food source of the killer whales are living in this rich cold waters.