রাবেয়া নামের অর্থ কি?রাবেয়া নামের মেয়েরা কেমন হয়? রাবেয়া দিয়ে ২০টি সুন্দর নাম

Why is ecology considered a branch of physical biology?

Ecology means the knowledge of an organism and its habitat. In other words, ecology is the knowledge of the reciprocal relationship between organisms and the environment in which they live. 

Since theoretical topics are discussed in ecology, it is considered a branch of physical biology.