Democritus proposed the first particle theory of matter in 430 B. C.E. He claimed that matter was made from small, indivisible bits. He referred to these bits as atomos, a Greek word meaning "uncuttable.” What is the modern definition of an atom? Group of answer choices

the smallest particle of matter

the smallest particle of a pure substance

the smallest particle that can still be considered an element

a unit of matter with a mass equal to one gram

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

Select the correct answer from each drop-down menu proteins are

The first generation of offspring from the cross of two parents is called the a.f1 generation b.f2 generation c.short generation d.p generation