If an atom contains 15 protons, it must contain 15 what?

When did lamarck publish his ideas on evolution answers?

How many protons, electrons, and neutrons does an atom of iridium (Ir) have

Which are electrical "nodes" of the heart? Check all that apply. sinoatrial node aortic node lymph node heart node atrioventricular node

Which era is characterized by stromatolites as the most abundant fossil

Which two types of matter are chemical pure substances

Which of the following best describes a noncontact force? A. a force that is able to act at a distance B. a force that must be physically touching the object it acts on C. a force that always pulls objects backward D.

Which type of energy used on earth comes directly from the sun

Aldosterone is secreted in response to changes in: select one: a. blood potassium levels. b. blood calcium levels. c. blood pressure. d. body temperature. e. blood glucose levels

How does a mutation in dna cause a disease that affects multiple organs?

Dylan is on a strict vegan diet. He doesn't consume meat, fish, eggs, or dairy products. Which nutrient is difficult to obtain naturally from a vegan diet