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Questions in biology

[Done] What is an ocean trench? Where do they occur?

[Done] What is a stem cell?

[Done] The Virginia Opossum has gradually spread from the east coast of the United States to the west coast, as well as northward into Canada. Researchers suggest this move north is in response to milder winters and man-made water reservoirs. This is an example of a: A. result B. theory C. hypothesis D. procedure

[Done] In a factory, a generator provides power. If a cell is like a factory, which organelle acts as the generator?

[Done] A cell biologist treated some cells with a stain and found that it was concentrated within the mitochondria of many types of cells. Which conclusion could the cell biologist draw regarding the results of this test? A. The stain could be used to identify mitochondria in living cells. B. The stain could be used to determine if cells were alive or dead. C. All stains will be absorbed by mitochondria. D. All mitochondria create stains.

[Done] What are the loosely packed photosynthetic cells in the leaf called? A. epidermis B. guard cells C. spongy mesophyll D. palisade mesophyll

[Done] What is the first structure to prevent water loss in the leaf called? A. Cuticle B. Stomata C. Epidermis D. Mesophyll

[Done] How is the sugar produced by photosynthesis transported from the leaf? A. in the xylem B. in the phloem C. through the stomata D. through the epidermis

[Done] Sandra wants to improve her body composition. Analyze the sentences to determine which friend gave her the BEST piece of advice. A. Sanchez told her to take diet pills and to eat less than 1,000 calories a day. B. John says to eat several, balanced, low-calorie meals throughout the day and to exercise regularly. C. Laurie says to eat only fruits and vegetables and to exercise regularly. D. Shelia told her to eat whatever she wants as long as she exercises five days a week for 60 minutes.

[Done] Explain why offspring may or may not resemble either parent.