Multiple choice

Haemoglobin is found dissolved in the plasma of a/an _______.

  1. man

  2. toad

  3. bird

  4. earthworm

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In vertebrates, hemoglobin is contained within red blood cells. However, in some invertebrates like the earthworm, hemoglobin is dissolved directly in the plasma.