Question

the diagram shows four different species of birds. each species has a different beak shape. which statement explains how these different beak shapes developed? natural selection based on diet selective breeding by humans resistance to herbicides through continued exposure inheritance of acquired characteristics

Explanation:

• Natural selection based on diet: Birds' beak shapes relate to their food - getting needs. For example, a woodpecker's beak is for drilling into trees (diet - related), a duck's beak is for filtering food in water (diet - related), a cardinal's beak is for cracking seeds (diet - related), and a snipe's beak is for probing in mud (diet - related). Natural selection acts on these traits as birds with beak shapes suitable for their diet are more likely to survive and reproduce.
• Selective breeding by humans: This is when humans intentionally breed organisms for certain traits. But these bird species are wild, and there is no indication that humans have been selectively breeding them for beak shapes.
• Resistance to herbicides through continued exposure: Herbicides are related to plants, not bird beak shapes.
• Inheritance of acquired characteristics: This theory (Lamarckian) is largely discredited. Acquired traits (like a bird wearing down its beak in a non - genetic way) are not passed on genetically.

Answer:

natural selection based on diet