B. They become extinct
Please mark as brainliest if this helped!
Answer:
because they have nothing wrong wit them
Explanation:
Answer:
True
Explanation:
During contraction of skeletal muscle fibers, the thin filaments slide inward toward the A band's center as a result of cycles of crossbridge binding and bending.
If you want faster replys or even replys at all, you need to give all the info.
Since it has 4 protons, it must have an atomic number of 4. (That makes it beryllium.)
Since it has a 4 protons and 5 neutrons, it has a mass number of 9.
