The energy that enters or leaves a living system during cellular processes comes from: A transforming matter into energy
B the kinetic energy of electrons in motion
С
the building or breaking of chemical bonds
D absorbing heat in the environment

Which of the following best describes the relationship between glucose and complex molecules such as hormones?

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?