Q: Cutting forests and clearing land has also increased the amount of what in the atmosphere? Choices: - oxygen - smog - pesticides - carbon dioxide A:
carbon dioxide

Q: Physical and chemical differences help ecologists distinguish between freshwater and marine types of what? Choices: - cities - habitats - microbiomes - biomes A:
biomes

Q: What is the most abundant biochemical compound, making up the cell walls of plants? Choices: - magnesium - cytoplasm - mitochondria - cellulose A:
cellulose

Q: The strength of bases is measured on what scale? Choices: - acid test - litmus test - pneumatic scale - ph scale A:
ph scale