Abiologist used the internet to contact scientists around the world to obtain information about declining amphibian populations. he was able to gather data on 936 populations of amphibians, consisting of 157 species from 37 countries. results showed that the overall numbers of amphibians dropped 15% a year from 1960 to 1966 and continued to decline about 2% a year through 1997. what is the importance of collecting an extensive amount of data such as this?
a. researchers will now be certain that the decline in the amphibian populations is due to pesticides.
b. the data collected will prove that all animal populations around the world are threatened.
c. results from all parts of the world will be found to be identical.
d. the quantity of data will lead to a better understanding of the extent of the problem.

Kate is studying the transformation from unicellular to multicellular organisms. which metaphor is the most appropriate to apply to the map of the timeline.

What blood vessels carry blood to the heart? away from the heart?

Suppose a point mutation, such as a change from an adenine to a guanine, occurs in the genome of a human sperm cell. the mutation could occur in any region of a gene. the effect of the mutation on the phenotype of the offspring will be determined by where the mutation occurs and its effect on the final gene product. in which of the following scenarios could the mutation alter the phenotype of the offspring? select all of the scenarios that apply the mutation occurs in the promoter and affects the rate of gene transcription. the mutation results in a new, dominant allele the mutation occurs in a portion of an intron not responsible for exon splicing the mutation occurs in a gene that controls development and alters differentiation of a cell type during development. the mutation occurs in a codon and alters the function of the final protein e mutation occurs in a codon, and the amino acid sequence of the final protein is unchanged.