Which example represents a transgenic organism? a bacteria that carries the gene to make human insulin
a human infected with a virus that carries its own DNA
a child who has an extra copy of chromosome 21
a mule with a mother that is a horse and a father that is a donkey

the backbone of the dna and rna compound is sugar phosphate.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.