(Q).
Q: The chemical used by the ants to weed their garden turns out to be what kind? Read this paragraph and choose the correct option from the provided answers: Choices: - sulfide acid - nitric acid - sealant acid - formic acid A:
(A).
formic acid

(Q).
Q: What blood pressure reading measures the pressure in the vessels between heartbeats? Read this paragraph and choose the correct option from the provided answers: 40.4 | Blood Flow and Blood Pressure Regulation By the end of this section, you will be able to: Describe the system of blood flow through the body Describe how blood pressure is regulated Blood pressure (BP) is the pressure exerted by blood on the walls of a blood vessel that helps to push blood through the body. Systolic blood pressure measures the amount of pressure that blood exerts on vessels while the heart is beating. The optimal systolic blood pressure is 120 mmHg. Diastolic blood pressure measures the pressure in the vessels between heartbeats. The optimal diastolic blood pressure is 80 mmHg. Many factors can affect blood pressure, such as hormones, stress, exercise, eating, sitting, and standing. Blood flow through the body is regulated by the size of blood vessels, by the action of smooth muscle, by one-way valves, and by the fluid pressure of the blood itself. Choices: - metabolic - plasma - systolic - diastolic A:
(A).
diastolic

(Q).
Q: What is a suggested explanation for a phenomenon or a suggested explanation for a relationship between many phenomena called? Read this paragraph and choose the correct option from the provided answers: In order to explain the observed phenomenon, scientists develop a number of possible explanations, or hypotheses. A hypothesis is a suggested explanation for a phenomenon or a suggested explanation for a relationship between many phenomena. Hypotheses are always based on evidence that can be tested by observation or experimentation. Scientific investigations are required to test hypotheses. Scientists mostly base hypotheses on prior observations or on extensions of existing scientific explanations. Choices: - query - system - process - hypothesis A:
(A).
hypothesis