Which of the following is the most usable form of nitrogen to plants?

ammonia

nitrates

nitrous oxide

nitrogen gas

Barometer is taken from the base to the top of a 279-m tower. assuming the density of air is 1.29 kg/m3, what is the measured change in pressure?

Fills the region around a magnet

What would happen to an ecosystem if a drought killed half of the plants that lived there?

What does the abbreviation DC stand for in physics? A. direct charge B. dark circuit C. direct current D. drop charge

A radioactive isotope of potassium (K) has a half-life of 20 minutes. If a 40.0 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain? A) 2.5 grams B) 5.0 grams C) 10.0 grams D) 40.

A spring tide can occur at what day and month?

For a given launch velocity, at which launch angle does the projectile undergo the maximum horizontal displacement

Electric force is blank proportional to the amount of charge and blank proportional to the square of the distance between the charges

What happens in the gray zone between solid and liquid?

Which statement describes Newton's law of universal gravitation? Mass has hittle effect on gravity between objects. Gravity pushes objects away from Earth's center, Gravity does not act between Earth and the moon.