3 is the answer because they play a key role in the nitrogen cycle.
Nitrogen.
Plants cannot use atmospheric nitrogen directly. Nitrogen from the air must be converted into the different form so plants can absorb it. Thus plants need nitrogen-fixing bacteria to convert atmospheric nitrogen into ammonium, which is available for plants to absorb it.
Answer:
1. Answer: Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.
Light travels at constant speed in vacuum even if the source is moving or stationary. If the source is moving, the apparent frequency/ wavelength changes.
Answer:
store energy in organic compound
Explanation:
The stored energy is used by the plant for a variety of life processes, such as, growth, reproduction, movement, and repair.
Photosynthesis is the process used by plants to make their own food, by capturing carbon dioxide and sunlight energy from the environment and releasing oxygen. this process occurs in the chloroplast .
