Sterilization is the process that kills all microbes by the use of physical/chemical agents.
Answer: look at the screenshot
Answer:
Abiotic is basically a non living factor so the answer is
D. Sunlight, temperature , conductivity, dissolved oxygen.
All other options contain one biotic or living factor like algae, star fish and crabs these aren't Abiotic.
Plants and animals provide food for humans. Plants cycle the air for humans too.
