Many cancers are characterized by defects in the rtk system. what are some of these defects and why aren't defects in the ldl or ferrotransferrin systems implicated in cancer?

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

the supermassive black hole is in the middle of the galaxy.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.