Answer:
Carbon dioxide or nitrogen
hopefully its carbon dioxide u can try
to check if it is. Sorry
Physical characteristic was present in a common ancestor, species may have similar physical characteristics (homologous structures).
<h3>
What are homologous structures?</h3>
A physical trait that distinguishes two or more species, such as a complicated bone structure or a body plan, may have been passed down from a common ancestor.
A common ancestor's evolutionary history causes physical characteristics to be homologous.
Sometimes, structures in an organism are similar to crucial structures in other animals, but they no longer serve the primary ancestral role. Vestigial structures are these structures, which are frequently scaled down.
Therefore, Physical characteristic was present in a common ancestor, species may have similar physical characteristics (homologous structures).
To learn more about homologous organs , refer to the link:
brainly.com/question/14963404
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Answer:
The peripheral nervous system (PNS) consists of all the nervous tissue that lies outside of the central nervous system (CNS).
Explanation:
The Earth's crust is the outer layer of the Earth and is made of solid rock. It is also the thinnest layer. As well known, the crust makes up 1% of the Earth. The crust of the Earth is broken into pieces called plates.
The temperature ranges from 0 - 700 Celsius. The Earth's crust is often compared to an apples skin, this because of it's thickness compared to the other three layers. The average thickness is 6 - 70 km.
Answer:
The ecological footprint (EF) estimates the biologically productive land and sea area needed to provide the renewable resources that a population consumes and to absorb the wastes it generates—using prevailing technology and resource-management practices—rather than trying to determine how many people a given land area
Ecosystem services are the benefits that people obtain from ecosystems. Ecosystem services are indispensable to the wellbeing of all people, everywhere in the world. They include provisioning, regulating, and cultural services that directly affect people, and supporting services needed to maintain the other services.
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