Why do animals that lay amniotic eggs or develop their embryos in a womb care for their young more than those who use external fertilization?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

If i add water to oil what will happen

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.