Based on these observations, which ecosystem is likely the most sustainable over time? A. Ecosystem 1, because it has the fewest species.

B. Ecosystem 2, because it includes both fish and birds.

C. Ecosystem 3, because it has the greatest amount of insects.

D. Ecosystem 4, because it supports the greatest amount of organisms.

you can't see the options

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question