Which machine is used most frequently in the scientific study of sleep and dreams to track brain waves in various stages of consciousness.

How many cells are our body made of ? ♡

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

What are two ways that harvesting algae from the ocean may benefit human society? how might the harvest of algae negatively impact the ocean communities where that algae grows? how could this be prevented?