Answer:
Explanation:
Hydrogen bonding is usually occur wen interaction with hydrogen atoms occur.
Hydrogen bonds joins DNA polymers because an hydrogen atom occur on on one base which is called hydrogen bond donors and another oxygen or nitrogen atoms on the base across from it which is called hydrogen bond acceptors.
Adenine “A” a purine and Thymine “T” a pyrimidine each have a donor and one acceptor, whereas Cytosine “C” a pyrimidine has one donor and two acceptors, and Guanine “G” a purine has one acceptor and two donors.
This atoms allows for hydrogen bond between them that gives them structure of DNA molecule.
A nucleotides is hydrogen bonded to T nucleotides while C nucleotides is hydrogen bonded to G nucleotide this is called complementary base pairing.
Answer:
Explanation:
This is because;
Rare animals are animals that are not common or species that are not common.
Protected animals are animals that are endangered and common.
Rare animals are animals that are not easily accessible.
Protected animals are common and are protected because they can easily be accessible.
Rare animals are animals that are not easily observed or recorded.
Protected animals can easily be observed and protected.
Rare animals are animals that are secretive and have shy behavior.
Protected animals behavior are not secretive in behavior.
Answer:
Amphibians skin is fully functional in blood production, and become anemic when the skin is covered by fungus. Amphibians have small lungs and use their skin for respiration (Cutaneous Respiration); they suffocate when the skin is covered with fungal growth.
Answer: It distributes oxygenated blood to the different tissues, it has to be wide enough to fit everything through as efficiently as it can.
essentially its like a tunnel and tunnels have to be wide to fit everything through