A cell is round and it is not able to produce it's own food. Which of the following organells does this cell have? A.
Cell wall

B.
Chloroplast

C.
Nucleus

D.
Central vacuole

Which of the following is an advantage of solar energy?

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism