12 points! describe the two major types of active transport in cells. .

1. SIMPLE DIFFUSION

Diffusion is the tendency of molecules to spread from regions of high concentration to regions of low concentration.  This movement is due to a concentration gradient.  This is the difference in concentration between two different regions.  An example - when you spray perfume in the corner of a room and eventually you can smell it everywhere.

2. OSMOSIS

Osmosis is the diffusion of water across a selectively permeable membrane from a region of high water concentration to a region of low water concentration.

haploid cells;

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this