Why is dark matter difficult to measure? a) because it does not exist in our galaxy. b) because it disappears when it encounters ordinary matter. c) because it creates so much heat it melts any instruments invented so far. d) because it does not emit anything that current technology can detect

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.

(amoeba sisters video recap: pedigrees and need

What are they five steps of cloning?