Arrange the following organisms in order from earliest to latest appearance: amphibians, jawless fish, trilobites, bony fish.

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.

The pronunciation aid that determines the stress placed upon a syllable is the

Name the organism that belongs to the kingdom protista.