Which type of environmental scientist is likely to study how different species of birds interact?
a. hydrologist
b. toxicologist
c. oceanographer
d. ecologist

The right answer is D. Ecologist.

Indeed the ecologist studies the interaction of birds with the environment. For example, have observed that ecological upheaval that we're actually living due to the industrialization has affected their migration by increasing the flow so that they seek new habitat to which they could live.

Answer is Ecologist so D?

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

the answer is d. chordata