Scandium has an atomic mass of 45 and an atomic number of 21 how many neutrons does this element contain 21 22 23 24

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

What are examples of the plant life and animal life that can be found in each type of terrarium

Which one is an advantage of external fertilization a. the offspring are genetically identical to the parents b. more eggs can be fertilzed at one time c. more sperm can be released at one time d. more protection is available for developing plz