Answer:integumentary system
Explanation:
integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature
<span>nebula--------» Protostar----------» Main Sequence----------» Red Giant---------»White Dwarf</span>
Active transport requires energy, passive transport does not require energy
Answer: Option C
Explanation:
Phenylketonuria is a rare genetic disorder in which an amino acid known as phenylalanine to build up inside the body.
PKU is a disorder in which the there is a defect in the gene which helps in create the enzyme needed to breakdown the phenylalanine.
The level of phenylalanine in the individuals before birth is normal but after birth the concentration of the amino acid phenylalanine is abnormally high because the enzyme is not synthesized in the body that is responsible for its breakdown.
No! After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals (including shrew-sized primates) were alive at the time of the dinosaurs. Many scientists who study dinosaurs (vertebrate paleontologists) now think that birds are direct descendants of one line of carnivorous dinosaurs, and some consider that they in fact represent modern living dinosaurs. This theory remains under discussion and shows that there is still much we don't know about dinosaurs.