Do you genuinely want help or ru trolling bc that’s actually common sense lol
The immune system, and the excretory system
(Honestly, all of them work to keep us 'healthy', but I believe these are the ones you're looking for)
B
Secondary succession means the regrowth in an ecosystem that already existed, after a disaster such as floods, fire, and etcetera. This is as opposed to primary succession whereby a new ecosystem is developed where none existed initially, usually on a new substrate.
Explanation:
In the picture on the left looks like a picture of a forest decimated by fire. On the right is a picture of the grass growing on the forest floor. This probably due to the fact that the canopy of the forest was destroyed in the fire enabling sunlight to penetrate to the floe of the forest supporting vegetation growth. This secondary succession. The grass acts like pioneer species. Later, the forest floor will be colonized by perennial, and then woody plants and the ecosystem will be back to its normal state.
Learn More:
For more on ecological succession check out;
brainly.com/question/11925354
brainly.com/question/10167897
#LearnWithBrainly
