Diatoms have cell walls composed of silicon dioxide.
A. silicon dioxide.
Answer:
A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts or human activities such as specicide and human population planning.
Explanation:
Lichens are the photosynthetic organisms.
Pollution is always a good way to go but you don't have to do air pollution you can do water pollution or both air and water pollution.
