The correct answer is the second option. Animals have two major types: vertebrates and invertebrates. Vertebrates are animals that have backbone while the invertebrates do not have one. Examples for vertebrates are birds and mammals while the latter are insects and squid.
Rain forests are important to western medicine because the supplies needed for the medicine is provided for you in the rain forest, therefore making rain forests important for western medicine.
Thermal energy causes matter to change state beacuse evrything has heat which is thermal energy hore heat is more thermal energy.
Ex.Ice changes into water
Ex.Water changes into water vapor
I believe it would be sperm
