Câu 27. Trong sự tiến hóa về các hình thức sinh sản thì………..có ưu thế hơn. A. sinh sản mọc chồi B. sinh sản hữu tính C. sinh sản vô tính D. sinh sản phân đôi Câu 28. Lông tơ có ý nghĩa như thế nào trong đời sống bay lượn của chim? A. Làm chim đẹp hơn B. Giúp chim làm mát cơ thể C. Giữ nhiệt và làm chim nhẹ D. Thu hút bạn tình Câu 29. Nguyên nhân nào không gây ra sự suy giảm đa dạng sinh học ở nước ta? A. Phá rừng làm nương rẩy. B. Tích cực trồng rừng. C. Sự ô nhiễm môi trường. D. Khai thác gỗ quá mức. Câu 30. Sự sinh sản của ếch giống cá ở điểm nào? A. Có hiện tượng ghép đôi B. Thụ tinh ngoài C. Thụ tinh trong D. Không có hiện tượng ghép đôi Câu 31. Điều nào dưới đây sai khi nói về cấu tạo ngoài của Thằn lằn bóng đuôi dài? A. Da khô có vảy sừng. B. Kích thước của các chi không chênh lệch nhiều. C. Cổ, thân và đuôi dài. D. Hai chi sau dài hơn hai chi trước rất nhiều

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