Sperm is defined by the American Society For Reproductive Medicine as male sex cells or "spermatozoa" that are produced in the testes (ASRM,1996-2015). In humans, the production of sperm requires functioning testicles, hypothalamus, and pituitary glands. ... Conception problems arise with abnormal sperm morphology, motility and function. ... In the review, "A Sea of Estrogens," John Briggs cautions that endocrine disruptors, such as pesticides, pharmaceuticals and plant hormones affect human reproductive systems by mimicking the effects of certain hormones (1995). ... The reduction ...

• Word Count: 616
• Approx Pages: 2
• Has Bibliography
• Grade Level: Undergraduate

Researchers determined that beard ear cells die and regenerate because of cell division of a new kind. Currently they are working on identifying cell signals and recovery of hearing and balance function. ... Plants and other asexual organisms have been "cloning" themselves since the beginning of time.... King were the first to clone frogs, by transferring the nucleus of one cell into a different cell. ... He placed the cell in a solutions that allowed the cell to shut down and reprogram itself. ...

• Word Count: 1040
• Approx Pages: 4
• Grade Level: High School

Perhaps we, the people, should rethink the multitude of ways we use animals for our purposes and endeavor to minimize their pain, discomfort, and ultimate demise in performing such necessary functions as research and agriculture. ... Rhesus monkeys currently being experimented on at Cal are forced to undergo cataract surgery after being subjected to distorted vision incurred by a human-planted opaque contact lens. ... It is argued that there is no viable alternative to animal research; cell and tissue cultures, while valuable in identifying toxicity and the like, do not offer the interaction a...

• Word Count: 1153
• Approx Pages: 5
• Grade Level: Undergraduate