We need blood because it carries oxygen and helps us sustain life. The organ that pushes blood through the body is the heart.
<span>E. chemical complexes of RNA or DNA protected by protein shell
https://quizlet.com/9713220/chapter-20-viruses-bacteria-and-archaea-flash-cards/
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one reason it is necessary for
humans to eat saturated fats is for protein
One half of a duplicated chromosome is called a sister chromatid
To show the different levels of classification and divide among species, and different organisms on planet Earth. It also creates a universal "language" for scientists around the world when referring to organisms (cougar & puma are the same animals; different name)
Example: The American Alligator and the Chinese Alligator (look it up!) are in the same family and genus, but are not the same species.
