Choose all of the characteristics from the list below that are examples of adaptations common among all birds.

(1) backbone

(2) cold-blooded

(3) give live birth to offspring

(4) sharp teeth

(5) solid bones

(6) four legs or feet

(7) feathers

(8) hollow bones

(9) warm-blooded

(10) four-chambered heart

(11) lay hard-shelled eggs

(12) two legs or feet

(13) soft-shelled eggs

(14) two-chambered heart

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

. ph changes the ability of them he enzyme to dissolve in water.

answer; ///progressive relaxation;