The body regulates blood pressure in a process in which nerves sense the blood flow resistance associated with higher blood pressure; the nerves relay this message to the brain;
the brain then slows down the heart rate and dilates the blood vessels, lowering the blood
pressure. This process is an example of -
positive feedback
heart disease
negative feedback
O action potential

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?