Which gas makes up 78 percent of our atmosphere but can be used by plants only when transformed by bacteria first?
a. hydrogen
b. oxygen
c. carbon dioxide
d. nitrogen

Aboy with an extra x chromosome probably has which of the following syndromes?

Gregor mendel is best known for his work with pea plants and for uncover many of the mysteries of genetics. one of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. what is the the name given to these units of inheritance which can be found on chromosomes? a) centromeres b) cytoplasm c) genes d) nucleotides

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion