Endocytosis is the active transport of molecules into a cell. in a cell extends its membrane around large particles to ingest them. is similar in that the membrane extends around particles, but these are much smaller particles dissolved in fluid; thus the process is analogous to "drinking." involves specific membrane proteins that bind molecules such as hormones or carrier proteins and brings the specific membrane protein and the bound molecule into the cell.

answer; i believe the correct answer is (a)0

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers