Which statement best explains how new dog breeds come into existence?
Select one:
1.Wolf genes are introduced into dog cells.
2.Cells from certain dogs are cloned in a laboratory and then fused.
3.Humans develop mating programs that select for certain traits.
4.Dogs with the preferred traits are cloned.

there is no

explanation:

trachea, alveoli, lung capillaries, arteries

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.