First blank is barb fish
And the second blank is newts
Mutation can cause instant adaptation while natural selection is the process by which adaptation occurs over a series of generations.
Some characteristics that is shared is a soft body and an outer shell to protect their body.
Answer:
The correct answer is option D. "whether the muscle moved the skeleton, the heart, or another type of internal organ".
Explanation:
It is possible to determine whether a sample of muscle tissue moved the skeleton, the heart, or another type of internal organ by analyzing its cellular structure and organization. For instance cardiac muscle is striated and organized into sarcomeres, while smooth muscle that is located in organs such as intestines, uterus and stomach are not organized into sarcomeres.
Your answer is "tiny structures in the cell that carry out the activities."
