(science and 15 points) which of the following processes produces food?

a. excretion
b. photosynthesis
c. reproduction
d. respiration

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?