What accessory organ allows bony fish to remain at a certain depth in the water without swimming?
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Define concentration gradient?
Why the orange trees are often sprayed with water?
Explain some common laboratory techniques?
How does iodine kill germs?
Which germ layer in mammals is predominantly responsible for forming the nervous system?
What does vacuoles do?
What is light reaction?
When the body is in a time of stress, which of the 2 divisions of the autonomic nervous system is primarily directing the response?
What is enzymes?
Explain why do substances react with each other?
How do worms affetc plant growth?
Explain how much salt is in the human body?