What is the name for millions of stars held together by gravity A. Supernova. B. Constellation. C. Solar system. D. Galaxy.

A "producer" in an ecosystem is: A) the sun's energy B) a plant C) a herbivore D) a carnivore E) an omnivore

What best describes the nucleus of an atom

Which of these types of reproduction provides the most protection to developing offspring of land-dwelling animals?

In the Cori cycle, when glucose is degraded by glycolysis to lactate in muscle, the lactate is excreted into the blood and returns to the liver. In the liver, lactate is converted back into glucose by gluconeogenesis.

How can you tell the cell in question 8 is undergoing meiosis, not mitosis?

Which of the following is a feeding source for fens? aquifers dexfoliants exfoliants nitrates

What system includes oceans, lakes, rivers, and groundwater? a. geosphere b. hydrosphere c. atmosphere d. biosphere

Fungal spores a. are only asexually produced. b. cannot be seen in a light microscope. c. are used to identify fungi. d. are produced by molds but not by yeasts. e. are only produced under harmful environmental conditions

Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm.

What's the function of rough er