Why would decaying logs in the woods not be an abiotic factor?

Abiotic factors include all the non living things present in the environment. Logs were part of a living tree and so it cannot be considered as an abiotic factor. Although the log is dead now, but it was part of a living thing before. I hope that this is the answer that has actually come to your desired help.

The answer is a: the eggs have half as many chromosomes as the body cells

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.