Hexagonal close-packed (HCP) structures exhibit ABCABC packing.

AIDS is caused by the Human Immunodeficiency Virus (HIV), which is a virus.

Cholera is caused by the bacterium Vibrio cholerae.

Tuberculosis is caused by the bacterium Mycobacterium tuberculosis.

Ferns have a dominant sporophyte generation, which is the leafy part of the plant.

All vascular plants, including angiosperms, gymnosperms, and pteridophytes, exhibit alternation of generations with both gametophyte and sporophyte stages.

All of these plant groups exhibit alternation of generations, which includes both haploid (gametophyte) and diploid (sporophyte) phases.

Liverworts are characterized by having a thallus, which is a flat, leaf-like structure.

Angiosperms are characterized by having seeds enclosed within a fruit, which is a key feature of this group.

Parenchyma tissue is primarily involved in storage, as it can store starch, oils, and water.

Meristematic tissue is responsible for the growth in length of stems and roots through cell division.

Apical meristem is responsible for the primary growth in length of the plant.

Apical meristem is responsible for the growth in length of the plant, found at the tips of roots and shoots.

Pteridophytes have a dominant sporophyte generation, while bryophytes have a dominant gametophyte generation.

Natural rubber is formed by the polymerization of isoprene.

Addition polymers are formed by the polymerization of unsaturated monomers.

Natural rubber is formed from the polymerization of isoprene.

Proteins are polymers formed by the linkage of amino acids through peptide bonds.

Nylon is a condensation polymer formed from the reaction of diamines and dicarboxylic acids.

Rubber is classified as an elastomer, which is a type of polymer that exhibits elastic properties.

Condensation polymerization involves the reaction of monomers with functional groups, resulting in the elimination of small molecules.

Addition polymerization involves the reaction of monomers with unsaturated bonds to form a polymer.

Condensation polymerization involves the elimination of a small molecule, such as water.

Hemoglobin is a transport protein that carries oxygen in the blood.

The quaternary structure of a protein is formed when two or more polypeptide chains assemble into a functional protein complex.

During alpha decay, helium nuclei (alpha particles) are emitted from the nucleus.

Beta decay involves the emission of beta particles, which are electrons or positrons.

Gamma radiation is the most penetrating type of radiation.

Alkanes typically undergo substitution reactions, especially with halogens.

Alkenes typically undergo addition reactions due to the presence of double bonds.