« previous next »

Author Question: Excretory structures known as protonephridia are present in A) flatworms. B) ear (Read 672 times)

j_sun

  • Sr. Member
  • ****
  • Posts: 384
on: Sep 17, 2013
Excretory structures known as protonephridia are present in
A) flatworms.
B) earthworms.
C) insects.
D) vertebrates.
E) cnidarians.


sammy

  • Hero Member
  • *****
  • Posts: 818
Reply #1 on: Sep 21, 2013
I remember it was A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

j_sun

  • Sr. Member
  • ****
  • Posts: 384
Reply #2 on: Oct 15, 2013
Thanks dude! Marking this solved.


« previous next »
 

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

Structures of β turns Structures of β turns
Structures of the external ear, middle ear, and inner ear Structures of the external ear, middle ear, and inner ear
Anatomical position of major neck structures Anatomical position of major neck structures
The Knee Joint: Anatomical Structures Influencing Motion The Knee Joint: Anatomical Structures Influencing Motion
Structures of the ionized forms of some representative fatty acids (part 2) Structures of the ionized forms of some representative fatty acids (part 2)
Structures of the major prostaglandins and thromboxane A2 Structures of the major prostaglandins and thromboxane A2
Video: The Lac Operon in E. Coli

For a complete list of videos, visit our video library