Aquatic salamanders and tadpoles obtain oxygen from water when it passes over the gill filaments.
which condition would lead to maximum absorption of o2 by the gills?
a) low oxygen in the water, low oxygen in the blood
b) low oxygen in the water, high oxygen in the blood
c) high oxygen in the water, low oxygen in the blood
d) high oxgyen in the water, high oxygen in the blood

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Fredrick griffith made a scientific discovery in 1928