Which part of a cell allows nutrients and other materials to enter or leave the cell? a. chloroplast b. cytoplasm c. nucleus d. cell membrane

Competition occurs between species when

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm