The contents of a cell can be chemically different from the surrounding medium because
(1) the nuclear membrane has pores
(2) the cell membrane is semipermeable
(3) materials can enter the cell, but they cannot leave
(4) materials can leave the cell, but they cannot enter

Heyhonestly, probably not. humans have always had a tendency to waste things. whether it's food, cosmetic, infrastructure, or our abandoned constructions,the landscape is littered with the refuseof man. archaeology wouldn't be a developed discipline if humans didn't leave things behind. in a way it makes us human

hope it mark me as brainlieast.

D. when it begins to fall back to the child's handhope i ! > w<

Molecules called lipids have long hydrocarbon chains that determine the way they act. they can be fats, oils, or hormones, and even exist in our cell membranes 

Synapse nervous system they process and transmit signals. in a neuron