Answer:
A
Explanation:
Today, the atmosphere holds about 21 per cent oxygen. ... When the first simple organisms appeared in the oceans more than 3.5 billion years ago, the atmosphere was mostly nitrogen, hydrogen, water vapor, and carbon dioxide
Answer:
Each biome has a unique set of environmental conditions and plants and animals that have adapted to those conditions. The major land biomes have names like tropical rainforest, grasslands, desert, temperate deciduous forest, taiga (also called coniferous or boreal forest), and tundra.
Explanation:
A biome is different from an ecosystem. An ecosystem is the interaction of living and nonliving things in an environment. A biome is a specific geographic area notable for the species living there. A biome can be made up of many ecosystems. For example, an aquatic biome can contain ecosystems such as coral reefs and kelp forests.
These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. "If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance. The example we will use here is ice melting into water.
Professional presentations is about making an impact on the audience. Your slides of the presentation should look perfect and should arrange in a sequence.
What makes a good professional presentation?
If we want to design our professional presentation in a beautiful manner then we have to write introduction first, then on the second number we should write body, and in last we should to write conclusion. Our introduction needs to briefly sum up that the audience don't get bored, we need to talk about only what is going on in presentation. Tell the audience about advantages, disadvantages as well as about the uses.
So we can conclude that: Professional presentations is about making an impact on the audience. Your slides of the presentation should look perfect and should arrange in a sequence.
Learn more about Professional presentation:brainly.com/question/14605443
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Heliocentric theory thank you for your time .
