Your bones and muscles work together to support and move your body. Your respiratory system takes in oxygen from the air and gets rid of carbon dioxide.
The double membrane. It's theorized that chloroplasts used to be their own single-celled organism in the environment (and therefore with its own membrane). Then, the theory states, a larger cell took in the chloroplast by endocytosis, which involves surrounding the chloroplast in the large cell's own membrane. The chloroplast would then have two membranes surrounding it. This is similar to the thinking for mitochondria becoming an organelle as well. Hope this helps! :)
Pericardium or pericardial sac.
Hope This Helps!
These or some hardcore questions lol where is this from ?
Photosynthesis and chemosynthesis Let me know if you want me to explain more in depth.
