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জীব বিজ্ঞানের যে শাখায় জীবগোষ্ঠী ও তাদের পরিবেশের সঙ্গে আন্তঃসম্পর্কে আলোচনা করা হয়, তাকে বাস্তব্যবিদ্যা বা ইকোলজি বলে।
বিজ্ঞানী Ernst Haeckel সর্বপ্রথম ইকোলজি শব্দটি প্রণয়ন করে।
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জীব বিজ্ঞানের যে শাখায় জীবগোষ্ঠী ও তাদের পরিবেশের সঙ্গে আন্তঃসম্পর্কে আলোচনা করা হয়, তাকে বাস্তব্যবিদ্যা বা ইকোলজি বলে।
বিজ্ঞানী Ernst Haeckel সর্বপ্রথম ইকোলজি শব্দটি প্রণয়ন করে।