What is free nitrogen?

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nitrogen that is ready for plants to use

nitrogen that has been fixed by bacteria

nitrogen that cannot be used by organisms

nitrogen that is returned to the soil by decomposers

The atmosphere has no effect on landforms

Which component of the nervous system takes in information from the environment? brain spinal cord sensory receptors motor neurons

How does crossing over increase variation in a population?

Which type of plant is a fern? A. vascular plant B. nonvascular plant C. gymnosperm D. angiosperm

A student has the high-power lens in position and appears to be intently observing the specimen. The instructor, noting a working distance of about 1 cm, knows the student isn't actually seeing the specimen. How so?

Define global warming and explain what has caused the recent trend of warming that the earth is experiencing.

this is one explanation of enzyme specificity that states an enzyme and its substrate possess specific complementary geometric shape that fits exactly into one another

Why do some people believe the human eye is an example of why evolution cant be true?

One Significant Figure Two Significant Figures Three Significant Figures Four Significant Figures 200 | 0.01 || 20 22||20. 1,230|| 8.88 || 136 155.6 || 1,245 8.880 One significant figure 200,0.01,20 Two significan figures 22, 20.

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? (a) He decreased the density by increasing the volume.