1) list and describe the four levels of organization from the simplest to the most complex and give an example of each.

Levels of organisation include,

1. Cells. Its function is in the living organisms and has unit structure which is the smallest. It has certain functions in the organisms. Example include, bone cells, nerve cells, and blood cells.

2. Organs. They are formed with certain tissues which works together and performs specific activity, Example include, skin, heart, and brain.

3. Organ systems. It has one or more organs and they work together in order to perform certain functions in the organisms. Example include, nervous system, skeletal system, and circulatory system.

4. Organisms. They can either take in materials and from food there is energy which is released, reproduced, grow to respond to environment and release waste.

Example include, animal, human, bacteria, amoeba, and mushroom.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

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