Inner membrane of mitochondrion
Answer: 1. mechanical weathering
2. Soil
Explanation:
1. Some animals such as moles dig which breaks down rocks underground.
2. Soil is different amounts of broke down particles some still have big particles like sand while others are really fine like clay.
I think #1 is pointing to the cell membrane
#2 is pointing to the nucleus
#3 is pointing to the chromosomes
and #4 is pointing to the cytoplasm
"Send a robot to measure how much oxygen is dissovled in ocean water at various depths, because the amount of oxygen dissovled in water changes with pressure" <–– the answer
A) Nuclear DNA is bundled up in linear strands - has nothing to do with the endosymbiosis theory.