Please give me numbers 6 and 7 answers

Terms such as individual, population, species, community and ecosystem all represent distinct ecological levels and are not synonymous, interchangeable terms. Here is your brief guide or program to understanding these ecological players.Individuals make up a population; populations make up a species; multiple species and their interactions make up a community; and multiple species and their interactions make up ecosystems when you include the abiotic factors.

Answer (d) the greenhouse effect is primarily caused by car and trucks;