In a circuit diagram, what does this symbol represent? a resistor
a light bulb
a battery
a switch

What is the difference between bacterial infections and viral infections?

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?

What factors contribute to the effect an environmental toxin has on the human body?