A virus's ability to infect an animal cell depends primarily upon the "<span>presence of receptor sites on the cell membrane"
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Cancerous tumors are malignant, which means they can spread into, or invade, nearby tissues. In addition, as these tumors grow, some cancer cells can break off and travel to distant places in the body through the blood or the lymph system and form new tumors far from the original tumor.
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Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others. ... Through this process of natural selection, favorable traits are transmitted through generations.
Heat and light (campfire), chemical ( beans as food), and kinetic (you hiking).
