Answer: B
Explanation: Stem cells are the building blocks of the human body. At the start of life, they divide over and over again to create a full person from an embryo. As we age, they replenish cells in our blood, bone, skin and organs. Stem cells could be powerful tools in treating injury and illness.
Puberty occurs when a part of the brain called the hypothalamus begins to produce a hormone (gonadotropin) that has an effect on the testes and ovaries causing an increase sex hormone — estrogen in girls and testosterone in boys.
Answer:
1.53*10^8 gallon
Explanation:
multiply 1.7*10^7 with 9 and change the decimal point
Answer: no problem ;) that easy oof
Explanation:
