Homework Help: Biology

Posted by mysterychicken on Thursday, March 4, 2010 at 7:12pm.

20. One difference between a gastrovascular cavity and a one-way digestive system is the presence or absence of
a. cell specialization
b. digestive enzymes
c. digestion within body cells
d. a moist membrane for nutrient diffusion
A?

21. In an open circulatory system,
a. water is drawn into the mantle cavity to provide oxygen to body tissues
b. lungs branch into small tubules to provide oxygen to tissues
c. wastes are eliminated directly to the environment from tissues
d. body tissues are bathed directly in fluid containing oxygen
D?

22. The system that does not allow for direct contact between oxygen-carrying cells and tissues is called
a. a one-way digestive system
b. the excretory system
c. a closed circulatory system
d. an open respiratory system
C?

-MC

No one has answered this question yet.

Answer this Question

Related Questions

biology - one difference3 between a gastrovascular cavity and a one-way ...
Biology - 20. One difference between a gastrovascular cavity and a one-way ...
Biology - Describe the features of the nasal cavity that moisten, clean, and ...
Science - Describe, in 200 to 300 words, the path food follows through the ...
science - Hi again. A question about the digestive system. How does teh ...
Nutrition - in 200 to 300 words, the path food follows through the digestive ...
SCI 241 - i need to know the path food follows through the digestive system and ...
SCI 241 - Describe, in 200 to 300 words, the path food follows through the ...
Bio - What digestive enzymes does the pancreas produce (pertaining to the ...
biology 2 - The digestive, circulatory, respiratory, immune, and excretory ...

For Further Reading

First Name:
School Subject:
Answer: