Fill in the blanks below using the following words to model the flow of energy from the sun to a human: cow, grass, human, sun

Grass uses energy form the to grow. A then eat the grass. When a eat a hamburger, energy is again passed up the food chain.​

What is the subscript for oxygen in its molecular formula

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?