« previous next »

Author Question: A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolut (Read 916 times)

penguins

  • Hero Member
  • *****
  • Posts: 903
on: Jul 12, 2013
A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from lungs of an ancestral fish is an example of
A) an evolutionary trend.
B) exaptation.
C) changes in Hox gene expression.
D) paedomorphosis.
E) adaptive radiation.


Millan

  • Sr. Member
  • ****
  • Posts: 368
Reply #1 on: Jul 13, 2013
I know it's B, we did this yesterday ;)


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

penguins

  • Hero Member
  • *****
  • Posts: 903
Reply #2 on: Jul 18, 2013
Thank you, thank you!!


« previous next »
 

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.

The female reproductive system, sagittal view showing organs of the system in relation to the urinar The female reproductive system, sagittal view showing organs of the system in relation to the urinar
bladder cancer bladder cancer
Polycystic kidney disease. Notice the presence of numerous fluid-filled sacs, or cysts, in these kid Polycystic kidney disease. Notice the presence of numerous fluid-filled sacs, or cysts, in these kid
viper fish 2 viper fish 2
Butterfly fish Butterfly fish
A Partially Filled 50-Unit Insulin Syringe A Partially Filled 50-Unit Insulin Syringe
Video: Transferring genes into plants Animation

For a complete list of videos, visit our video library