Cross over? i have no idea lol
Answer:
An ecological pyramid is a pyramid that illustrates the relations between living organisms at different levels
Answer:
Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins. Without proteins, plants wither and die.
The telescope I feel like is one of the most important one
