Natural selection involves energetic trade-offs between

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

In the sentence "a mining company will consider the distribution of coal when deciding how to mine the coal," what does the word distribution mean?