B cells play a crucial role in the defense of pathogens. They are responsible for producing antibodies that help fight the enemy.
Biomass decays and produces gases such as nitrogen and very small amount of helium. in many places it is used to produce energy by comustion.it's mass becomes less and a layer of humus type organic substance is left on the soil....if i'm not incorrect :)
ANSWER: Trapped in a ship's ballast or water tank.
REASONING: There are many examples of species being transported in the ballast or water tank of ships. Ships need to be stable so they don't turn over. Stability is provided by weight in the bottom part of the ship called the ballast. This weight often comes from water that is stored in water tanks or the ballast area of the ship. Water is taken in to the ballast at the beginning of its voyage. When it arrives at it's destination, the ballast water is often drained. Anything living in that water will also be drained in to the new location. This is how species like the white perch can be introduced into new areas.
The sun is the original source for ALL food webs
