Johnny is a forensic scientist. he tests for gunshot residue. which of the following tests might johnny use?

johnny uses the test, which should turn the material red if gunshot residue is present. for another item, he only has a small amount of material to test, so he chooses which is known to return conclusive results even on very small amounts.

a. dermal nitrate
b. sem-edx
c. griess reagent

a. dermal nitrate
b. sem-edx
c. griess reagent

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

The cluster of developing cells from conception until birth is called an

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?