Explain how humans obtain the energy and matter they need in order to survive?

We eat and drink to obtain the energy and matter we use to survive

We consume nutrients through the foods we eat, and the things we drink, but we also get nutrients from the sun. Depending on what you eat helps your body obtain the vitamins and calcium your body needs to survive. It is found that the more orange juice you drink the stronger you bones in your body get, yet orange juice is acidic, so it eats away at the enamel on your teeth. Every solution for a healthy body to help in survive depends on the persons body type.  Hope I helped, If so, can I get a heart? :D

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.