An ion must cross the cell membrane through active transport instead of passive when the ion
a. negatively charged
b. carried across by a protein
c. going against the concentrate ingredient
d. to small to move independently

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

hope this any more questions i am here plz mark brainliest

can you make it bigger i can't see it

i think the answer is composed of atoms

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time