In the diagram above a person at location X on the Earth would experience day when –
1. the Earth revolves around the sun.
2.the Earth rotates on its axis.
3.the moon revolves around the Earth.
4.the sun revolves around the Earth.

Many state and local authorities are making laws regarding recreation on lakes, rivers, and oceans to reduce water pollution. why would lawmakers need to consult with scientists before making these laws? a) to make scientists feel important b) so that the laws reduce pollution by a sufficient amount c) so that parks and lakefront facilities will still make large profits d) so that the public will believe that the laws are important to follow

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Why is excretion necessary to maintain homeostasis?