Question

1 multiple choice 4 points a certain invasive species of fish is introduced into a freshwater lake and rapidly begins to dominate the habitat. what is a potential ecological consequence of this invasive fish species on the lakes ecosystem? the overall fish biomass in the lake will significantly decrease due to the invasive species consuming other fish. the invasive fish species will lead to clearer water by consuming large amounts of algae. native fish species may experience population declines due to increased competition for food and habitat. the invasive fish species will likely disappear quickly due to the lack of their usual predators in the new ecosystem. 2 multiple choice 4 points what is the strongest evidence we have to show common ancestry? comparative anatomy dna fossils comparative embryology 3 multiple choice 4 points a section of dna which codes for a protein is a(n) gene histone base pair nucleotide

Explanation:

1. Invasive species often out - compete native species for resources like food and habitat, leading to population declines of native species. The first option is not always true as the invasive species may increase overall biomass initially. The second option is not a common consequence as they usually disrupt the ecosystem rather than improve water clarity. The fourth option is incorrect as lack of predators usually helps invasive species thrive.
2. DNA provides the most accurate and detailed evidence of common ancestry as it contains the genetic code that is passed down through generations. Comparative anatomy can be misleading due to convergent evolution, fossils have gaps, and comparative embryology is less precise than DNA analysis.
3. A gene is a section of DNA that codes for a protein. Histones are proteins associated with DNA packaging, a base - pair is a unit of DNA structure, and a nucleotide is a building block of DNA.

Answer:

1. Native fish species may experience population declines due to increased competition for food and habitat.
2. DNA
3. gene