A) এই তত্ত্বটো আলফ্ৰেড ৱালেচে প্ৰস্তাৱ দিছিল।
B) পৰিৱৰ্তনসমূহ সৰু দিশাবদ্ধ পৰিবৰ্তন।
C) এক-পদৰ ডাঙৰ পৰিৱৰ্তনে প্ৰজাতিৰ সৃষ্টিৰ কাৰণ।
D) পৰিৱৰ্তনৰ ফলত ডাঙৰ পাৰ্থক্যসমূহ ধীৰে ধীৰে জনসংখ্যাত উদ্ভৱ হয়।
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