A physician examines a patient who complains of breathing problems she finds fluctuations in the patient’s blood pressure and heart rate the physician thinks it’s because of a brain injury which part of the brain is affected

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet