Q: Many of the protist species classified into the supergroup excavata are asymmetrical, single-celled organisms with a feeding groove "excavated" from one side. this supergroup includes heterotrophic predators, photosynthetic species, and these? Choices: - insects - reptiles - mammals - parasites A:
parasites

Q: What plays a variety of important roles in biochemical systems? Choices: - mutation - reactants - bacteria - protein A:
protein

Q: Natural gas, such as those burned by gas stoves, is composed mostly of this? Choices: - sulfur - carbon monoxide - oxygen - methane A:
methane