Liz is examining a plant cell under a microscope. she sees many small green organelles inside the cell. her teacher explains that the process of photosynthesis takes place inside these organelles. what type of organelle is liz looking at?

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

How does the study of genetic disorders such as pku biologists understand normal alleles?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels