What was the initial working hypothesis for how plants gained mass?

Which statements describe ways in which heat can be generated? By rubbing two sticks together, enough heat can be generated to start a camp fire. 1) Heat energy is generated by ice when it is melting.

Identify the situation where work is being done. A. Carrying a box of crayons across the room. B. Lifting a backpack off the floor C. Sitting on a stool D. Holding a football

Cells are known as the foundation of all life. How have these small structures changed our planet?

A 1.5 kg bird is gliding at a height of 12 m with a speed of 3.8m/s. What is the kinetic energy of the bird, to the nearest joule?

Technician A says that one heater hose should be hot and the other hose cool if the heater is functioning okay. Technician B says that both hoses should be hot to the touch.

Which best descibes ionic compound formulas

Explain fully, in your own words, why the temperature during PCR goes through cycles of 94C, 50C, 72C.

4. What is a compound? Name an example.

What is one important role that ocean waters have in heating Earth? absorb and transport solar energy transport nutrients and waste create and emit solar energy wear away rock and soil

Shelly was surprised to learn the dwarf planet Pluto used to be considered a planet. What would have had to be true for Pluto to remain categorized as a planet? Pluto would need to have an atmosphere.