Most of the Earth's oxygen occurs in the form of minerals in the crust and mantle. The oxygen that is available in the atmosphere is used primarily by plants, animals, and bacteria to perform cellular respiration.
Why is running out of oxygen still not a real concern?

A. Oxygen is recycled through the interrelated processes of photosynthesis and cellular respiration.
OB. Oxygen can easily be mined from rocks and sand and then be released into the atmosphere.
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OC. The Sun creates more than enough new oxygen atoms in the atmosphere by splitting phosphate molecules.
OD. Lightning creates large quantities of ozone, which quickly breaks down into oxygen molecules.
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Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Nucleic acid certain protein cell membranes certain carbohydrates

Sexual reproduction in the parent cell will result in offspring with a) identical genetic information. b) half the genetic information. c) double the genetic information. d) four times the genetic information.