Complete the sentence. Symbiosis is best described as .
Select one:

an animal living in only one ecosystem

a close relationship between two species that benefits at least one of the species

an organism killing another organism for food

two organisms competing for a resource

Which component of a milankovitch cycle is related to periodic ice ages throughout earth’s history?

According to the article about the zhou dynasty, this dynasty was broken into different eras because its capital changed from place to place. how many different eras were there in the zhou dynasty? a. two b. six c. ten d. fourteen

Which of the following is an accurate description of the recent political history of the democratic republic of the congo? a. religious tensions have escalated into full-scale civil war a number of times since the belgians left the country in 1960. b. the political leader who gained power after the overthrow of a corrupt dictator was assassinated. c. the military leadership felt the country was stable enough, so they permitted democratic elections to take place. d. in 1990, a dictator seized and has held power ever since.