Answer:The Ozone Hole. One billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to split molecules of H2O and CO2 and recombine them into organic compounds and molecular oxygen (O2). ... As oxygen in the atmosphere increased, CO2 decreased.
I honestly think A. Predators never benefit prey populations, cause if they are eating the organism population decreases.
Answer:
d. water is easier to move over the respiratory surface
Explanation:
The concentration of O2 in water is approximately 40 times less than air (4-8mL per liter), this fact in addition to water's greater density and viscosity in comparison with air, means a more demanding process in general. To adapt and reduce these disadvantages aquatic animals developed grills, creating foldings with a larger surface area for gas exchange.<em> The main advantage for gas exchange in water is that the respiratory medium remains moist at all times. </em>
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Answer:
Sugar,coffee powder, powdered drink mixes,bouillon cubes, corn starch,flour,cornmeal food coloring.
Explanation:
Answer:
1) limbs
2) Stegocephalia
3) 367.5 million years ago
4) Fishes
5) Fossils
6) 367.5 million years ago
7) Fishes
8) unearthed or preserved