This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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1.3.1. The bond between two nitrogenous bases in DNA is a hydrogen bond. Peptide bonds link amino acids. The correct option is A only.
1.3.2. Precocial birds have hatchlings that are relatively mature and mobile soon after birth. Altricial birds have helpless hatchlings. The correct option is A only.
1.3.3. The pancreas has both exocrine functions (producing digestive enzymes) and endocrine functions (producing hormones like insulin and glucagon). The pituitary gland is primarily an endocrine gland. The correct option is B only.
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1.3.1. The bond between two nitrogenous bases in DNA is a hydrogen bond.
This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.