After three half-lives, a sample contains 10 grams of parent isotopes. how many grams of the parent isotope were present to start?

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Where substance is produced during cellular respiration

The human body maintains a temperature of around 98.6 degrees at all times. enzymes are involved in almost every chemical reaction in the body. which of the following describes the connection between these two statements? a. enzymes function best at a specific temperature. b. the body needs to be warm to prevent hypothermia. c. the body is kept relatively warm to prevent too much enzyme action. d. there is no connection between the two statements.