The Heart and Blood Vessels (The Need For A Circulatory System)

Question 1

What is an example of a small organism that does not need a circulatory system?

Answer 1

Amoeba

Question 2

What type of system do small organisms such as Amoeba not need?

Answer 2

Circulatory systems

Question 3

Why do amoeba not need a circulatory system?

Answer 3

As nutrients and oxygen are supplied to their cells and wastes are removed by diffusion

Question 4

For what type of organisms is diffusion adequate instead of a circulatory system?

Answer 4

Organisms that are only a few cells thick

Question 5

What do larger organisms need a circulatory system to supply their cells with?

Answer 5

All the materials they require