A pathogen is a disease carrying vector that has the ability to spread using a variety of different mechanisms. A pathogen that is a contagion has the ability to spread through touch. An example of such a pathogen would be the one that results in staph infections.
Explanation:
When water turns to ice, it expands/contracts
The (molecules) in water is more tightly packed than in ice, so water has greater density than ice. Don't let the fact that ice is a solid fool you!
The cell grows, makes a copy of its DNA, and prepares to divide into 2 cells.
Or for APEX---->The chromosomes are duplicated or the cells prepare for mitosis
The cell prepares for mitosis.
Organelles are manufactured(apex)
