"How do we know that organisms existed millions of years ago"?

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Asap what occurs after cytokinesis is completed at the end of meiosis 1?

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.