Practice Quiz

NAEP Science Grade 12

Category - Biology

Start a Study Session Sign up for Question of the Day
Roundworms are among the most primitive organisms that have a ?
  1. Nerve net.
  2. Digestive tract.
  3. Respiratory organ.
  4. Circulatory system.
Explanation
Correct Answer: B. Roundworms are some of the most primitive organisms to have an actual digestive track consisting of a mouth and anus connected by a digestive tube. More-primitive organisms, such as hydra and jellyfish, have a network of interconnected neurons called a nerve net (A). Roundworms lack both respiratory organs (C) and a structured circulatory system (D).
Previous Next
Was this helpful? Upvote!
Login to contribute your own answer or details
Start a Study Session Sign up for Question of the Day

Top questions

Related questions

Most popular on PracticeQuiz