Hello!! The answer would be A - The SA node. It is known as the "pacemaker" because it initiates the heart's rhythmic contractions. I hope I helped!! Have a great day. :)
Answer:
Furthermore, the axial skeleton consists of six parts: the skull, the ossicles of the middle ear, the vertebral column, hyoid, rib cage, and the sternum while the appendicular skeleton consists of limbs and girdles. Axial and appendicular skeleton are the two main parts of the endoskeleton of vertebrates including humans.
Explanation:
Answer:
Genes that are located on the same chromosome and that tend to be inherited together are called linked genes because the DNA sequence containing the genes is passed along as a unit during meiosis unless they are separated by crossing over.
Explanation:
Pathogens are disease causing agent
probably not, it misht be a satelite, and it burns when it enter in our atmosphere
