In this lab, you will be using black worms (Lumbriculus variegatus) to investigate the effects of various chemicals on their pulse rate. Which of the following correctly describe some of the characteristics? Select all that apply.

1. its blood circulates in a closed circulatory system

2. Freshwater worm found throughout North America and Europe

3. Prefers the shallow habitats found at the edges of ponds, lakes, or marshes

4. Feeds on decaying vegetation and microorganisms.

Answer: All the above options are correct about the characteristics of Lumbriculus variegatus.

Explanation:

Lumbriculus variegatus also called the black worm belongs to the phylum Annelida and is used by biologists to illustrate:

-blood vessel pulsations,

-swimming reflex,

-peristaltic crawling behavior,

-giant nerve fiber action potentials.

These studies where carried out on them due to the characteristics they possess. These includes:

-its blood circulates in a closed circulatory system

-Freshwater worm found throughout North America and Europe

-Prefers the shallow habitats found at the edges of ponds, lakes, or marshes

-Feeds on decaying vegetation and microorganisms.