The periodic table
1. is arranged by atomic mass
2. is arranged by number of protons
3. was developed by early alchemists
4. is divided into vertical periods and horizontal groups

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

In which squares should the phrase "green pods" appear a) a and d b) b and e c)a,c, and d d)a,b,c,d and e