Soil contamination. The others don't really make sense in context
A food web refers to the graphical or pictorial representation of the food consumption interconnections among living organisms in a particular ecosystem. The food web usually have a base, a middle section and a top section. The base of the food web is made up of plants, which are called the producers. Plants are able to make their own food and others in the web depend on them for food. The middle section is made up of primary consumers, which are those organisms that feed directly on plants while the top section is made up of secondary consumers, which are those that feed on primary consumers.
Answer:
Metaphase
Chromosomes line up at the metaphase plate, under tension from the mitotic spindle
I think the answer is the first one, "conversion of radiant energy into chemical energy"
