The finches on the Galapagos Islands are a good example of adaptation because they all trace their ancestry into a small group of finches that inhabited these islands, but diversified in accordance to the environment. On the Galapagos Islands, there are finches that have numerous types of different beak shapes and sizes, despite them all being derived from a single group of finches that had the same characteristics. The reason for this is that once they got to these islands, there were multiple niches int the food chain that were free for taking. Some finches started to feed on plants, some on seeds, some became insect-eaters etc. Every food type needs special adaptation so that the finches can eat it more easily, or even be able to get to its nutritional part, thus their beaks started to change in accordance to their food preference.
Answer:
Light ray coming inside the human eye refracts four times,
the first refraction takes place in cornea, secondly it takes place in aqueous humor, followed by refraction in lens and then in vitreous humor.
The answer is B) Genetic variation
We can use a punnett square to predict the outcome of self-fertilization for the f1 hybrids of a monohybrid cross. In this case, the punnett square should be set up as a blank 2x2 square.
Self-fertilization is the joining of male and female gametes and/or nuclei from the same haploid, diploid, or polyploid organism. It is an instance of extreme inbreeding. These are 2X2 squares with four boxes for a monohybrid cross, with each box signifying a fertilization between the parent gametes.
Selfing is widespread, ranging from simple hermaphrodite plants and animals to multicellular organisms (especially invertebrates). Selfing occurs when two individuals (or their cell nuclei) that were produced by a previous mitotic division of the same individual interbreed in unicellular organisms like protozoa.
The Punnett square is a table that lists every conceivable result of a genetic cross between two people of known genotype. The Punnett square is a square that has been partitioned into four quadrants in its most basic form.
To learn more about the punnett square, here
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