Complete the following sentence: Environmental science can answer questions about by analyzing and observing the world and testing ideas about it. physical laws moral values philosophy and art natural phenomena

littering streams           is the answer

i don't know. if i were you, i would search it up online : d

answer; both surfaces of the membrane are nonpermeable

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.