This is because human have a much larger surface area.
Small organisms have a small surface area and thus simple diffusion meets their transport requirements.
As the size of the organisms increases, its surface area to volume ratio decreases. This means it would take days for molecules to diffuse through a large animal, so humans have a circulatory system with a pump to transport materials quickly around their bodies.
Therefore due to their large size, humans require a specialized transport system.
Answer: With legs underneath the body.
Explanation: Adios amigo/amiga.
Answer:
Increased pollution I think is the right answer
When Mitosis occurs it is allowing more cells to be made with only the one organisms Chromosomes, meaning that you can have the full 23 pairs of chromosomes. However in the case of Meiosis, the data for the new cells have to be taken from more than one cells saved DNA so it will mix with the reproductive cells of the opposite sex.