Why is it a problem in planter animals become endangered or extinct?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

How does natural selection change thephenotypes within a population over time?