Aplant lacking a mineral or failing to make a needed vitamin dies before it can bear food for human consumption. a. true b. false

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

What causes darkening of the skin as melanin production increases

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of