Radioactive dating determines the numerical age of rocks containing which element? A. Calcium
B. Nitrogen
C. Oxygen
D. Uranium

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

What is the number of phosphates in an atp molecule

Read the sentence. “yesterday we arrived late for the outdoor concert in the city gardens.” which words in the sentence are adverbs? a. late; city b. yesterday; outdoor c. yesterday; late d. outdoor; city