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

When an astronaut in orbit experiences apparent weightlessness, a. no forces act on the astronaut. b. no gravitational forces act on the astronaut. c. the net gravitational force on the astronaut is zero. d.

Compared with ultraviolet radiation, infrared radiation has greater (a) wavelength; (b) amplitude; (c) frequency; (d) energy.

From where on Earth could you observe all of the stars during the course of a year? What fraction of the sky can be seen from the North Pole?

how is acceleration related to force when mass is constant, according to Newton's second law of motion

The light outside tends to be softest at what time of day? Midmorning Noon Midafternoon Early evening

Which has the same relationship as circle:cylinder? Triangle:sphere, square:window, rectangle:box, pentagon:counter

Which training principle does this scenario represent?

What is the wavelength of a wave? A. the amount of time that one full cycle takes. B. the distance from the beginning to the end of a cycle. C. the amount of cycles that occur in a given time. D.

Two football players collide on the field. Before the collision, their total momentum was 450 kgm/s to the north. What is their total momentum after the collision? A. More than 450 kgm/s north B. 450 kgm/s north C. Less than 450 kgm/s north D.

Jane and John Doppler effect