Some examples of animals that undergo external fertilization include fish, amphibians, and many invertebrates such as sea urchins and corals. External fertilization occurs when eggs and sperm are released into the environment where they meet and fertilize outside of the body.
Internal
Homeostasis is internal. It refers to the body's ability to maintain a stable internal environment regardless of external influences.
Integumentary system covers both internal and external body structures.
Internal
external
internal
The 2 fertilisation's are external fertilisation, or internal fertilisation. External fertilisation is the type frogs do.
internal is in and external is out fertilisation
VERY INTERNAL
internal
i think internal
internal
Yes
arthropods usually have external fertilization
Yes.
dogs have internal fertilisation which means that thier babies grow inside of them and they do not lay eggs