Which of the following provides the best example of selective breeding? a
Scientists have noted that different varieties of birds on different islands have beaks that are suited to the birds available foods
b
Racehorses that run fastest are the ones that are allowed to produce offspring, leading to faster racehorses
c
Leopard seals captured in Antarctica have thicker layers of blubber than harbor seals captured in the Pacific Ocean
d
Hummingbirds have a long, narrow beak that enables them to reach food in the deepest part of the flower

b

Explanation:

the fastest race horses were the only ones chosen to breed

B.)

Explanation:

Selective breeding is when humans choose selective traits for an organism such as speed.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%