activity Round 4 G12

A pouchlike extension of their esophagus in which symbiotic bacteria digest the cellulose of plants is

• Detritus

• Rumen

• Stomach

Detritivores feed on detritus, which is:

• fungi and plants

•  decaying bits of plants and animal material

• roadkill

Reptiles and amphibians have _ chambers in the heart.

• 4

• 3

• 2

• 1

Oxygen constantly diffuses from air or water into an animal's bloodstream. For this to happen, the concentration of oxygen in the blood must be

• Greater than the concentration of oxygen in the air or water

• Greater than the concentration of carbon dioxide in the air or water

• Lower than the concentration of oxygen in the air or water

• Lower than the concentration of carbon dioxide in the air or water

A closed circulatory system is one in which

• Blood spreads freely throughout the body's tissues

• Blood travels through a system of blood vessels that extend throughout the body

• Blood travels through blood vessels into spongy cavities called sinuses

• Blood travels through a system of blood vessels and air sacs

During this type of symbiosis, both organisms benefit

• Commensalism

• Parasitism

• Mutualism

During this type of symbiosis, one organism benefits, the other is neither helped nor harmed

• Commensalism

• Parasitism

• Mutualism

During this type of symbiosis, an organism lives within or on a host organism where they feed on tissues or blood and other bodily fluid

• Commensalism

• Parasitism

• Mutualism

Gasses diffuse most efficiently across:

• a thin, moist, selectively permeable membrane

• a thin, dry, selectively permeable membrane

• a thick, dry, selectively permeable membrane

• a thick, moist, selectively permeable membrane

Which of the following groups of animals has the most efficient gas exchange?

• Mammals

• Amphibians

• Reptiles

• Birds