The virus in the video is very sneaky. Pretending to be a friend, it attaches to a projection on the cell's so the cell brings it inside. Then the cell recognizes the virus as an enemy and starts to respond.

not sure if this is what you'r looking for eubacteria and archaebacteria

the growth of the plants is affected by the heat of the light. what is the student doing?

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.