Why are streak plates used to test minerals? O A. They show you the color of the impurities in the mineral.
B. They show you the silicon content of the mineral.
O C. They show you the true color of the mineral.

Astudent conducts an experiment to determine how the amount of water given to a plant affects it growth what is the dependent variable for this experiment

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

What part of the cell does 9 represent? a. cytoplasm b. lysosome c. ribosome d. centrosome