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.  the erosion of top soil reduces the diversity of organisms in an ecosystem.  c.  global climate change may lead to the extinction of many species that are unable to adapt to the changes.  d.  all of these

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

The table lists the observations students made about four specimens under a microscope. based on these observations, what specimens did the students examine? animal plant virus prokaryote cell membrane present ribosomes present lysosomes present nuclear membrane present cell wall present ribosomes present nuclear membrane absent cell wall present ribosomes present nucleus present large vacuole present reproduces inside of a cell nucleus absent rna present 2019 edmentum all rights reserved intl

Construct at least two possible hypotheses for the student’s experiment.