1. Describe one observation that supports the theory that mitochondria and chloroplasts originated as independent prokaryotic organisms

2.Explain how a symbiotic relationship like the one described in the endosymbiotic theory would have benefited each cell.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

a. the production of carbon dioxide through the process of photosynthesis

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: