This structure can only be found in a plant cell and not an animal cell. nucleus ribosomes cell wall mitochondria

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

2. which is the last step in the scientific method?

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes