Which of the following environmental changes is likely to allow the most individuals to survive?
a.
transition from a meadow to a forest
b.
massive volcanic eruption
c.
acres-wide forest fire
d.
oil spill in a bay

A.  transition from a meadow to a forest

 Transition from a meadow to a forest is the correct environmental change that would likely to allow the most individuals to survive because meadow is grassland which may be occupied with organisms with low trophic levels such as primary producers like grasses, primary consumers like herbivorous insects and animals. But forests involves the diversity of trophic levels like primary producers like trees, primary consumers like herbivores such as rabbit, deer, secondary consumers like snakes, fox and tertiary consumers like lion and tigers. Hence, forest environment will allow the growth of diversity of life forms.

they deliver oxygen to the blood

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.