Answer:
Rivers possess different features as they age. Old rivers usually have a low stream (gentle) gradient and low erosive energy. They usually have broad U shape, the water is usually brown and they have flood plains. Seasonal floods are also common.
Answer:
D. More bacteria congregated in the red and blue light regions because the algae in those regions produced the most oxygen.
Explanation:
In 1883, Theodor W. Engelmann conducted a classic experiment in which he wanted to help determine the relationship between wavelengths of light and the rate of photosynthesis. We consider that these bacteria congregated in search of the oxygen production, because when they are exposed to light, it is possible for them to produce oxygen through photosynthesis.
Ecosystems change when all of the above components listed change ie, living components of an ecosystem, nonliving components of an ecosystem, or their stability is disrupted.
Hence correct option is D.
- A community of creatures and their physical environment make up an ecosystem.
- Ecosystems can be terrestrial, aquatic, or marine and come in a variety of sizes.
- The term "biome" refers to broad classifications of terrestrial ecosystems. Ecosystems, the dynamic network of living and nonliving things in a place, change gradually over time.
- New plants and animals either thrive or suffer when they are introduced to a region. Sometimes thriving species suppress native species. The system as a whole starts to shift when this occurs.
- If the living components i.e., flora and fauna of the ecosystem change then there will be increase or decrease in food availability and either surge in predators or no predators at all. hence it will greatly affect the ecosystem.
- non living components such as temperature, water availability, natural calamities can also affect the ecosystem. it can lead to extinction or migration from one place while influx of immigration to another.
- if the stability of ecosystem is disrupted due to change in living and non living components then also the ecosystem will be affected.
hence all of the above options are correct.
learn more about Ecosystems here:brainly.com/question/842527
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Answer:
B. An Estuary
Explanation:
it is a coastal body of water surrounded by land
