The endosymbiotic theory was proposed because mitochondria, chloroplasts, and free-living prokaryotes have similar

A.

cell walls.

B.

cell membranes.

C.

cell nuclei.

D.

vacuoles.

During temperature inversion ... Question 3 options: 1. sulfur oxides combine with water in the atmosphere 2. an influx of acidic water causes a rapid change in the pH of water 3. levels of ground-level ozone decreases 4.

Two frog populations (same species) living in two neighboring lakes sing slightly different courtship songs. increased irrigation makes the land between the two lakes wetter, allowing frogs to expand their ranges to the area between the lakes.

What four-carbon compound is regenerated at the end of the Krebs cycle? With what two-carbon compound does it combine at the start of the Krebs cycle?

What is the cotyledon in vascular seed plants?

Mental processes occurring on autopilot, oblivious to the present, are known as

Which area of the brain must gain control to overcome a panic response? a. the amygdala b. the frontal lobe c. the locus coeruleus d. the cerebellum?

The correct sequence going from smallest to largest is Select one: a. cell - molecule - tissue - organelle - atom. b. atom - molecule - organelle - cell - tissue. c. molecule - atom - organelle - tissue - cell. d.

What Three things should you check when deciding the reliability of science articles?

How does sediment form? A weathering breaks down rocks and other material. B chemical changes cause sediment to cement together. C loose material is compacted by pressure. D molten rock cools below the earth surface

Which of the following are benefits of cardio exercise? A. Resting blood pressure decreases B. Energy levels increase C. The heart becomes more efficient D. All of the above