Aphids eat plant sap, and they excrete honeydew that ants can use as one source of food. Ants have been observed protecting aphids from predation by ladybugs. This is most likely an example of: a) Facultative mutualism b) Obligate mutualism c) Ectoparasitism d) Endoparasitism e) Commensalism

Ectoparasitism. (Ans D)

Explanation:

Parasitism is a type of relationship which is found between two species where 1 species, the parasite, gains benefits that come from the expense of the host species. Ectoparasitism is one of the examples of parasitism.

Ecto-parasitism: It is defined as a relationship where the parasite lives in the skin of the host, not within the body of the host. In this parasitism, the relationship between a host and parasite is non-mutual. In this parasitism, Ants are benefiting and aphids are being harmed.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a