How many half lives will have passed if 7500 atoms of carbon-14 remain? How old would the rock be? ANSWER QUICK PLSS (the topic is actually integrated science but they didn't have that option :/)

Why can't you grow plants with adhesion water?

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.

Which organ controls breathing? lungs alveoli heart diaphragm