Alineage, in an evolutionary sense, is best described how? a. a successive chain of ancestor and descendent populations perpetuating through generations. b. species evolving into other species. c. a collection of unrelated species that interact. d. an ancestral species and some of its descendents.

The correct answer is A. A successive chain of ancestor and descendant populations perpetuating through generations.

Explanation:

A "lineage" is a term used in biology and evolution to refer to a sequence or chain of organisms that are related to each other as it  includes an ancestor and all descendants from it through generations. In this way, each organism evolved from the organism that is before this in the lineage and derives in new organisms that appear after it.

Due to this, lineages depict the process of evolution over time and are also sections of evolutionary trees which are major structures that show the evolution of species. Considering this, it can be concluded a lineage is "A successive chain of ancestor and descendant populations perpetuating through generations".

"do a testcross with a homozygous recessive plant."

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.