The only one correct answer would be:
c. Yellow or red hues in the soil indicate the presence of iron or aluminum.
Euglenas are heterotrophic.
Hererophic (must consume food) and autotrophic (can make its own food).
Answer:
I would believe the mesosphere would be the most difficult layer to breathe. Troposphere is where we are, ov we can breathe here, stratosphere would be hard to breath in as well
Answer:
Proteins would be made in ribosomes.