How many number of electron shells does calcium have?

Why dose there need to be both consumers and producers in an ecosystem?

A wave has a velocity of 24 m/s and a period of 3.0 s. Calculate the wavelength of the wave

The periodic table is arranged into groups and periods. Describe the benefits of this arrangement.

Which is an unintended consequence of the widespread use of pesticides on corn crops? increased amount of corn grown each year the rise of pesticide-resistant insects decreased cost of producing corn the deaths of insects that feed on corn

At what angle North of East must the ship travel to reach its destination? Let East be 0◦ and North 90◦.

A car is traveling 80 km/h if the car's speed remains constant how far will it have traveled in 3 hours a. 3km b. 26.7km c. 80 km d. 240 km

True or False? Gases such as water vapor condense when they are * heated*.

If a chromosome on unfolds itself how is transcription enhanced

Two friends, barbara and neil, are out rollerblading. with respect to the ground, barbara is skating due south at a speed of 5.9 m/s. neil is in front of her. with respect to the ground, neil is skating due west at a speed of 1.4 m/s.

What process is used when the sun transfers light to plants A. conduction B. radiation C. convection D. all of these