Cyanobacteria were the first organisms to photosynthesize but they died out before the end of the Precambrian.
True or false

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Which statement correctly compares metaphase i and metaphase ii? in metaphase ii twice as many chromosomes line up along the middle of the cell as in metaphase i. in metaphase i twice as many chromosomes line up along the middle of the cell as in metaphase ii. in metaphase ii twice as many chromosomes are pulled to opposite ends of the cell as in metaphase i. in metaphase i twice as many chromosomes are pulled to opposite ends of the cell as in metaphase ii.

Approximately how many times does an average human heart beat in a lifetime?