It is a chemical process which enables heterotrophs to obtain energy without oxygen.
The answer to your question is,
A. sewage treatment plant
-Mabel <3
ovulation
Explanation: ovulation is the release of eggs(ova) from the ovaries is the cycle of change which occurs in female reproductive system for a month.
Answer:
Shutting down factories that discharge materials to the rivers.
The largest sum of US pollution currently caused by factory-related substance
Explanation:
my pfp!
1 Down: Aorta
2 Down: Blood
3 Across: Circulatory
3 Down: Capillaries
4 Down: Oxygen
5 Across: Systemic
6 Across: Ventricles
6 Down: Valves
7 Across: Heart
8 Across: Veins
I hope this helps! Please give brainliest and thanks if you can
