Answer: a, low birth to death ratio
Explanation: immigration adds more population, and when resources are abundant, people do better. a high birth to death ratio would mean more people are being made.
The CEREBRUM is responsible for those functions
A carbohydrate<span> is a biological molecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen:oxygen atom ratio of 2:1 (as in water); in other words, with the empirical formula C</span>m(H2O)n<span> (where m could be different from n). Carbohydrates are basically sugars.</span>
The researcher can do more testing and collect data