500 because of the 10% rule when moving up in food chains, for example; patch of grass-200J rabbit eats some of it but doesn’t eat all - 150J the rabbit runs around for a bit and loses energy, the fox doesn’t eat all of the rabbit - 50J ( just a rough example may not be completely right but the concept of the rule is there and the energy).
Answer:
Option A, Offshore Drilling
Explanation:
In the process of offshore drilling, oil is extracted from the wells which are located at the surface of ocean floor.
Different types of oil rigs are used for oil extraction depending on the depth of the ocean.
It is a good mode of extracting oil from sources that have remained untapped since long. With the new technology, several nations have been able to explore this oil reserve and have become independent in terms of energy
Hence, option A is correct
In a microbiology laboratory, a culturing involves growing microbes in the lab. It is the method of multiplication microbes where they are allowed to reproduce under controlled laboratory conditions. Microbial cultures are very important for diagnostic tests in medicine and research in microbiology.
