Helen is learning about how the Sun can give heat to the Earth without touching it. Which of these would be a good model to help her understand how heat comes from the Sun?

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

What type of cell is produced after fertilization occurs and the gametes combines ?

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen