A substance x has a mass of 0,20g and molecular mass of 40g/mol. Find the number of moles of substance x.​

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.

1. list three scientific reasons cockroaches may fly.