Consider the model for natural selection. Describe a scenario that represents this model of natural selection. A) In a populatio
n of rabbits, some are brown all year long. When it snows
these rabbits cannot hide from predators and they become extinct.
B) In a population of sunflowers, mutations cause some flower heads to produce more seeds. More seeds means that there are more sunflower plants over time.
C) In a populations of birds, mutations result in different beak sizes so the birds do not compete for food in the area. The bird population is made up of birds with many different types of beaks.
D) In a population of herbivores, a change in the habitat provides leaves that are high up in the trees. The herbivores with longer necks can reach the leaves. They survive and reproduce. The herbivores, over time, have longer necks.
B) In a population of sunflowers, mutations cause some flower heads to produce more seeds. More seeds means that there are more sunflower plants over time.
C) In a populations of birds, mutations result in different beak sizes so the birds do not compete for food in the area. The bird population is made up of birds with many different types of beaks.
D) In a population of herbivores, a change in the habitat provides leaves that are high up in the trees. The herbivores with longer necks can reach the leaves. They survive and reproduce. The herbivores, over time, have longer necks.
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<span>The phase of mitosis during which the mitotic spindle begins to form is PROPHASE.
</span>At prophase, the nuclear envelope is broken down; the chromosomes disperse into the cytoplasm, condenses and become visible; and more importantly, the mitotic spindle fibers form.
</span>At prophase, the nuclear envelope is broken down; the chromosomes disperse into the cytoplasm, condenses and become visible; and more importantly, the mitotic spindle fibers form.