An observation is . A. A positive explanation for events using prior knowledge

B. Always quantitative

C. Made using any of the five sentences

D. Always qualitative

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

Which image shows labeled organelles that are present only in plant cells?

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.