Question

ectotherms are animals whose regulation of body temperature depends mostly on sources of heat outside its body.
an endotherm is an animal that regulates body temperature, at least in part, with the heat that its body generates.
f. the diagram shows the levels of organization in the human body. label the diagram with the following terms: organ system, cell, organ, and tissue.

Explanation:

To solve this, we recall the levels of organization in the human body from smallest to largest: cell, tissue, organ, organ system.

Step 1: Identify "a"

The image labeled "a" shows a single cell (like a neuron). So "a" is cell.

Step 2: Identify "c"

The image labeled "c" shows a group of similar cells (neurons) working together, which is a tissue. So "c" is tissue.

Step 3: Identify "b"

The image labeled "b" shows the brain, which is a structure made of different tissues working together (an organ). So "b" is organ.

Step 4: Identify "d"

The image labeled "d" shows the human body with multiple organ systems (like nervous, skeletal, etc.). So "d" is organ system.

Answer:

• a: cell
• b: organ
• c: tissue
• d: organ system