Did you know?
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
Did you know?
Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.
Fossil of an early invertebrate animal showing bilateral symmetry
The burning of fossil fuels has greatly increased atmospheric CO2 levels and temperatures.
Diagram of a typical fossil-fueled power plant
(a) The site of Zhoukoudian outside of Beijing, China, spans several hundred thousand years and (b)
Two views of the phylogenetic relationship between Neandertals and modern H. sapiens.
The growth of GHG emissions is greatest in the rapidly growing economies of India and China