3. Circle the letter of each sentence that is true about water's surface tension. A it helps some insects "walk across the surface of the water
B. It refers to the tightness across the surface of the water
C. it is caused by polar molecules repelling each other
D. it causes raindrops to form round beads

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

What was the land like over 500 million years ago? what was under the sea?