¨both biotic and abiotic factors affect ecosystems. distinguish between these two types of factors, and explain how they might have affected the tortoises that darwin observed on the galapagos islands.

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

What materials must dams have to produce electricity, and what must occur?