which theory states that all of the life on the planet is decended from an orginal life form that lived 3.5 billion years ago

Suppose the length of the tube used in our experiment is 4 m and a tuning fork of frequency 150 Hz is used in air where the speed of sound is 340.8 m/s? (Give your answers as integers.

When a steady direct current flows through a coil, the only opposition to the flow of current is the resistance of the wire from which the coil is made.

One student did an experiment on the rock cycle. The steps of the experiment are shown below. Collect five pieces of wax of different colors. Use a plastic knife to scrape off thin shavings of the pieces of wax.

A dolphin is trying to jump through a hoop that is fixed at a height of 3.5 m above the surface of her pool. The dolphin leaves the water at an angle of inclination of 40°.

A boat is rowed at 8 km/hr directly across a river that flows at 6 km/hr. What is the resultant speed?

Which compound is composed of oppositely charged ions

Sara, who weighs 66 kg, is on a guilt trip after eating a 788-Calorie (788 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. She decides to work out before going to her weekly weight-watchers' meeting.

Can you get sunburned through glass?

Which statement about a signal transduction pathway is true? a. A signal transduction pathway provides a means for a signal molecule to pass through the cell membrane and initiate a chain of events inside the cell. b.

If a car is traveling on the highway at a constant velocity, the force that pushes the car forward must be A. greater than the force of friction exerted upon the car. B. less than the force of friction exerted upon the car. C.