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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
Internal regulators are mechanisms within an organism that control their biological processes, such as hormones that maintain homeostasis. External regulators are environmental factors outside the organism that influence its biological responses, like temperature or availability of nutrients. Both internal and external regulators play key roles in determining an organism's growth and development.
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External
Crayfish have an external skeleton and starfish have an internal skeleton relying on a water vascular system for movement.
There are many internal and external factors that affect child development. One internal factor is the genetic makeup of the child.
development of an economy is an internal phenomenon as it comes from within.
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internal. They develop inside the womb
External, because they lay eggs.
Cheetahs are placental mammals, so they have internal fertilization and internal development within the uterus of the female.
Mammals have internal gestation with viviparous birth.