Early organisms in the Precambrian era converted to oxygen. O A. water vapor
O B. nitrogen
O c. carbon dioxide
D. sulfur dioxide

because the light is a great source of energy for the plants to survive. (i hope this )

a covalent bond, specfically triple bond

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set