Q: Behind the pupil, a single lens focuses light on a layer of what? Choices: - photons - chloroplasts - electrons - photoreceptors A:
photoreceptors

Q: What chemical affects the onset of puberty and duration? Choices: - steroids - enzymes - acids - hormones A:
hormones

Q: A spontaneous change process called neutrino oscillations can occur only if neutrinos have what property? Choices: - velocity - temperature - color - mass A:
mass