For what can we use the doppler effect to deduce in astronomy A. the shape of orbital path of an object
B. whether the object is traveling toward or away from us
C. the Chemical composition of the objects
D. the type of spectrum the object emits

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas

For mendels studies, why was it important that his subjects, pea plants, could reproduce quickly and and produce many offspring?