Which of the following best summarizes photosynthesis?
A. A chemical reaction involving nitrogen and other atmospheric gases
B. An adaptation of plants that allows them to add nutrients to the soil
C. A process by which plants produce sugar using the energy of sunlight
D. An exchange of gases between animals and the air or water of their habitat

What is the chemical formula of the following compound

Define dew point. i am writing this part to be able to ask the question

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.