If the air has 10 g of water vapor yet it could hold 40 g, what is the relative humidity? a. 25% b. 20% c. 40% d. 4%

I think it's a.25 because if it holds 40g but has 10g then the 10g is about 25 percent because: 4g = 10 percent 2g = 5 percent So to get to 10g you have to do 4+4+2, which is 10+10+5 percent which= 25percent. Hope I helped!

Ifound this on google “here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.for more information go to the website below › bitesize › guidesi hope this you for what your looking for. can you plz mark me brainliest?

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.