The similarities in the fore limb bones of humans,cats,dolphins and bats leads to the conclusion that they all evolved from a common ancestor.
Answer: trachea
Explanation:
During inhalation, air moves from the larynx into the trachea. Air enters the oral cavity, and then it moves into the pharynx.
Question 1: The correct answer should be the one that shows the producer first, (->) followed by the herbivore, (->) with the carnivore last.
Producers are organisms that harvest their own 'food' using things like the sunlight and water. Examples of producers are grass and other vegetation.

The herbivore, or an organism that consumes only vegetation and/or algae, consumes the producer.

⇒

The carnivore consumes meat, or other animals such as the herbivore. It's the last.

⇒

⇒

Therefore the answer is
B.
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Question 2: I'm pretty sure that succession as well as regrowth after volcanic eruption (Just look at Mount St. Helens. After 30-35 years after the eruption, nature is
still recovering) happens over time/slowly. I would say global warming [C](?) would be the answer.
Answer:
Chlorophyll absorbs the red and blue segment of the white light and photosynthesis occurs most efficiently at these wavelengths.
When the light falls on the plant, the chlorophyll pigment absorbs this light and electrons in it gets excited.
This process occurs in a complex protein system which is collectively called as a photosystem.
Explanation: