Answer:
Atmosphere refers to the thin blanket of air that surrounds the earth.
It serves many important functions such as:
- It contains a mixture of gases that are essential for the existence of life on earth. For example, carbon dioxide is essential for photosynthesis and oxygen is essential for cellular respiration.
- It also serves as the reservoir of water in the form of water vapor. Thus, it forms an important constituent for the water cycle.
- It maintains the temperature of the earth. Through the greenhouse effect, it maintains the temperature of the earth in limited ranges.
- It protects the earth from harmful rays of the sun. For example, ozone inhibits the entry of most of the UV rays of the sun into the earth environment.
Answer:
Presence of chlorophyll pigment in the leaves and cell walls were made of cellulose
Explanation:
The first plants that appeared on the land areas were comprised of the main component known as the cellulose that forms the cell wall of the plants and is responsible for making the various parts of plants such as branches, plant stems, and leaves, stronger and supportive.
In addition to this, the leaves of these primitive plants were comprised of green pigments known as chlorophyll that absorbs the sunlight and CO₂, and helps the plants in preparing the food for themselves as well as for the consumers, and also liberates oxygen (O₂) with it.
Thus, these are the two common characteristics that supported the idea that the primitive land plants had a relation with the green algae.
Because it can respire anaerobically, without oxygen.
Hope this helps!
<h2>Species richness </h2>
Explanation:
Resource partitioning is a type of strategy of coexistence among species which allow species to use natural resources in different ways and it may be temporal or spatial
There are two attributes of a community which will tend to lead to lower species richness in a community:
1) Most species are generalists, utilizing a broad spectrum of resources
: Species that can live in many different types of environments, and have a varied diet are considered generalists
2) Most species are specialists, utilizing a narrow spectrum of resources: Specialists are those species that require very unique resources, these type of species have a very limited diet or need a specific habitat condition to survive
