The structure labeled X on a single-celled organism is most similar to the A
skin of a multi-celled organism.
B
brain of a multi-celled organism.
veins of a multi-celled organism.
stomach of a multi-celled organism

Why has two different alleles for the same trait?

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.

Spirochetes have a twisting and flexing locomotion due to appendages called