The fact that dna sequences are more similar in more closely related organisms is evidence of what? a. optimal design in organismsb. adaptationc mutationd. descent with modification

The correct answer is d. descent with modification

Explanation:

The DNA sequence is more similar in more closely related organisms which shows that they shares a common ancestor. This means that closely related organisms are descended from a common ancestor who over time evolved and modified due to the dissimilar environmental condition and challenges.

This evidence of common ancestor for all life forms can be reflected by DNA as a genetic material in all life forms, universal genetic code, and DNA replication machinery. Therefore the correct answer is d. descent with modification.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

six grader is what i am ssorry