Both. You can use it as singular or plural.
<span>When an athlete is nearing the end of a race and her cells are low on oxygen, it is likely to be fermentation. When cells have used up all their oxygen they ferment glucose into lactic acid. Fermentation is a metabolic process that consumes sugar in the absence of oxygen</span>
B) Endocrine disruptors mimic hormones that regulate critical biological processes
Answer:
Igneous rocks and Metamorphic rocks determine the age of the earth.
