Question

Question:

A very general trend in animal evolution has been toward increasing structural complexity. What are two reasons behind this? Select the two that apply.

Options:

A. There is an evolutionary 'drive' toward greater structural complexity.

B. Natural selection tends to favor more structurally complex organisms over less structurally complex ones.

C. Structurally complex organisms are necessarily derived from structurally simpler ancestors.

D. Evolution can only modify or build on what already exists.

Answer 1

option and are most suited reasons for increasing structural complexity. option. A says there is evolutionary drive towards a greater complexity Ever since life began on earth complexity increased. Unicellulats forms are simpler than multicellular ones. (cells join to form tissue, tissue form organs, organs form organ system and finally a comfalene organism) with time proteins became more hydrophobic. Complexity increased with evelution but nectural selection will not favor structurally complese organism just for its complexity. If the organism is adapted to environment and reproduces efficiently, natural selection will favour it other wise not. So option (b) is organisms necessarily derive I from simple ancestors. This must be true because simple ancestors are the most primitive life forms. we talk about the Last Universal Common ancestor, as the universal being that doasted about 4 billion years ago Slanned on

Very So simple ancestors have pared way for the complese generations. Biologis to have studied the eye and suggest that matter intricate much possible from simple ones through evolution. option @ says evolution can only modify or build on what already exists I Though evolution can modif calready existing life form but that necessarily doesn't mean that complenity will increase in that process. If a modification that confers an advantage to an organism leado to simplicity in life form there is no reason thate that evolution will not favour such a modification. So option ② is not applicable. Just think about the simplest organisms that survive and reproduce or multiply without a complexe organisation. Think of the infamous Corona virus, simple yel- survivins raking it difficult for all of us. 0 @ should be most So option (A and valide options. val -- CamScanner