Which of the following is an example of how a changing environment is important for the sustainability of living systems?
a.
the water cycle ensures that water used by one organism will be available for another organism in the future.

b.
global climate change may lead to the extinction of many species that are unable to adapt to the changes.

c.
the erosion of top soil reduces the diversity of organisms in an ecosystem.

d.
all of these

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

Fungi exist as single cells or as branching networks of multicellular filaments. how does the structure of filaments relate to their function

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.