How did the chemicals in Earth's prehistoric surface become alive

The term 'prehistory' refers to the time before writing was invented. true or false?

What is the difference between undifferentiated sperm cells and sperm?

What is the relationship between the oxygen cycle and the carbon cycle?

Calculate the osmotic pressure of a solution containing 19.15 mg of hemoglobin in 15.4 mL of solution at 29 ∘C. The molar mass of hemoglobin is 6.5*104 g/mol.

Which letter indicates the cavity that contains the digestive organs?

What does this similarity at the molecular level in yeast and humans most likely indicate

Which of these activities is not considered to be a marine ecosystem threat? overfishing. ocean pollution. coastal development. ocean alkalinity?

What is another common intramuscular injection site for 2mL or less of a drug? a Ventrogluteal b. Vastus Lateralis c Deltoid d Infraspinatus

Which element acts as a hydrogen acceptor during aerobic respiration? (A) hydrogen (B) carbon (C) oxygen (D) nitrogen (E) phosphorus Can someone explain this one for me?

How do bacteria and viruses differ in the ways they affect cells in the body?