Afuel cell converts chemical energy into

heat

heat is ur answer

The fuel cell follows a chemical reaction  to change over hydrogen-rich fuel into electricity.

Explanation:

An fuel cell is made out of an anode, a cathode, and an electrolyte film. It works by going hydrogen through the anode of a power device and oxygen through the cathode. At the anode site, the hydrogen particles are part into electrons and protons.

The protons go through the electrolyte film, while the electrons are constrained through a circuit, producing an electric flow and abundance heat. At the cathode, the protons, electrons, and oxygen consolidate to create water particles.

answer: - b cells

explanation: -

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.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!