The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Teaching tools for instruction
Researchers have found that science instruction can be quite effective in grades 4 to 7.
Creating Easy-to-Read Instruction
Teaching Models: Designing Instruction for 21st Century Learners
The Inclusive Classroom: Strategies for Effective Differentiated Instruction