During which period of the Paleozoic Era did the first amphibians evolve?

Permian

Devonian

Cambrian

Carboniferous

What is the speed of wave with a frequency of 5Hz and a wavelength of 0.25m?

A car traveling on a straight road at 15.0 meters per second accelerates uniformly to a speed of 21.0 meters per second in 12.0 seconds. The total distance traveled by the car in this 12.0-second time interval is (1) 36.0 m (3) 216 m (2) 180.

Which of the following occurs when the parasympathetic nervous system PNS is activated

what happens when tectonic plates move away from each other? A. molten matter cools and sinks towards the core B. lava travels way from the crust and forms the mantle C. molten matter seeps through crust and forms new land D.

There are many types of significant lines in blueprint reading. Which line defines the walls and surface boundaries of prints?

Wave can be described as A. a continuous transmission of energy from one location to the next B. The disturbance of particles in an area C. The transmission of energy through individual particles D. The motion of particles in a medium

A germ is also called a microorganism or a microbe. True False

What is 1.33Ω plus 2Ω?

As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors