Atoms are the smallest unit of non-living things and CELLS are the smallest unit of living things.
Water expands as it freezes, so ice generally has more oxygen in it than liquid water, making it denser.
1- B
2-B
3-C
4-B
5-A
6-A
I cant see the options for question 7, but here are the answers for 1-6. Hope they help!
Answer:
c. macula densa
Explanation:
The cells of the macula densa are sensitive to the concentration of sodium chloride in the distal convoluted tubule. They are a part of the nephron.
Answer: B is an unsaturated fatty acid
