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! :)
Answer:
You would expect a plant to produce more oxygen on a sunny day because there are more sun rays available to plants so photosynthesis is easier to maintain, as well as oxygen production.
I think the answer to this is Karyotype or law of dominance. <span />
Osteoporosis <span>is one of the most serious long-term side effects of severe calorie restriction.</span>
<span>The single most abundant chemical substance of the body, accounting for 60% to 80% of body weight, is "Water"
Hope this helps!</span>
