From diffusion of nutrients from underlying layers
Pelicans and humans have complex heart because there is need
for them to deliver more oxygen per liter blood to the body. Also, there heart is made up of four chamber and they have high
metabolic rate which necessitate them to supply efficient blood throughout the body.
Answer: A. Average rainfall has decreased
Explanation:
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Answer:
Photosynthesis takes place inside the chloroplasts that sit in the mesophyll of the leaves.
Explanation:
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If predators eat too many keystone species, it can lead to the ecosystem becoming unstable (Option B). A keystone species helps to define an entire ecosystem.
Keystone species are species that maintain the homeostasis (stable state) of the ecosystem.
In consequence, the lack of these species in an ecosystem would change it or cease to exist altogether.
An example of a keystone species is the jaguar that feeds herbivorous species capable of decimating plants in an ecosystem.
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