the diagram shows sexual reproduction. what is forming at point a?

flagella
sperm
zygote
egg

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Which of the following electromagnetic waves can create ions?