The answer is light. Mind going to my page and answering my question? Hope this helps.
Answer:
Reproduction is vital to the success of a species.
explain:
For a species to survive it must be able to produce more offspring than it loses though old age, disease, and predication. Living things can reproduce in different ways, asexual reproduction and sexual reproduction.
Alveolar sacs, bronchi, trachea, pharynx
Igneous rock is the answer