2. wegener’s idea that tidal forces might cause continental drift was shown to be impossible when it was
a. determined that earth’s magnetic field was too strong
b. shown that the tidal forces needed to move continents would stop earth’s rotation
c. determined that earth’s density was too low
d. shown that no tides occurred 200 million years ago

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

Apart of an ecosystem that can restrict the growth of a population is referred to as