There are many food chains within a food web.
Food chains in an ecosystem have consumers but no producers.
A food chain always begins with a producer because these organisms are the source of energy for other organisms in an ecosystem.
Answer:
4.
An internal stimulus is a stimulus that comes from inside an organism. You may have experienced an internal stimulus of hunger after a long day at school, and this prompts you to eat some food in order to regain needed energy
2 zygotene
3 pachytene
4 diplotene
3 pachytene is the answer here cause that is where there is exchange of genetic material
im thinking its carbon