The study of living things is called biology. There are two types of living are these are plants and animals.
The correct answer to the question is A that is They have gradually become smaller in colder parts of the country.
What is climate?
Climate is the long-term weather pattern in an area, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years.
According to the question, the size is directly proportional to the temperature of that given area. Colder the climate smaller the organism and vice versa. This statement is given by Allens and is known as Allens rule
Hence, the correct answer is option A.
For more information about climate change, refer to the link:-
https://brainly.com/question/14688752
