An element is defined by its number of what? protons electrons neutrons all particles

Which of the following best describes the purpose of technology?

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods. c. it shows that these organisms share the same habitat. d. it provides evidence that these organisms suffered a genetic mutation.