How long does it take for changed in an ecosystem to be reversed

What is the area of a triangle with a base of 7 cm and a height of 4 cm

The correct notation for an alpha particle

What are the main elements of wheat bread

The colors of the rainbow are found in which part (s) of the electromagnetic spectrum? Television waves Telemetry waves Visible light and television waves Visible light

Sodium, atomic number 11, forms an ionic bond with an atom of an unknown element. What is one possible choice for the ther element in the compound?

The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

Which answer choice best explains why nuclear reactions release more energy than chemical reactions? Electrostatic forces of repulsion are thousands of times stronger than gravitational forces.

A train's mass is 18181.81 kg. What is its weight?

a 3.0m long frictionless pendulum swings with a maximum angluar displacement of 10 degree from the vertical. at its lowest position the kinetic energy of the pendulum is 20.0j what is the potential energy of the pendulum when the kientic energy is 5.

How are hypotheses and theories related to each other?