1.form and structure of an organism or any of its partsmorphology 2.the splitting of a lineage into separate and distinct speciesspeciation

3.group of related organisms that share features and characteristicsspecies

4.small or underdevelopedvestigial

1) morphology

2) speciation

3) species

4) vestigal

Explanation:

Morphology is the study of forms or the physical appearance of organisms.

Speciation is the splitting of lineage into distinct species capable of interbreeding and producing fertile offspring.

Species is a group of organisms that are genetically related and share features and characteristics. They are capable of interbreeding and produce live offsprings.

Vestigal organs are organs that have lost their function over time, they are usually small and underdeveloped. Example is the human tail bone.

enzyme would break down

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).