Universe, galaxy, solar system, star, planet, moon
<span>Melanin helps protect the skin against effects of the sun such as skin cancers and premature aging. In African American skin, melanin provides a sun protection factor (SPF) equivalent to 13.4 compared to 3.4 in white skin and thus the former have lower incidences of skin disorders associated with exposure to the sun.</span>
Yes people are trying to plant more trees and promote awareness on afforestation and some have even started making rules the 'clean air act'
You could record how much they eat how many times they swim around in a day you could weigh your species of fish.