Frequent question: Why are photosynthetic algae limited to surface water in marine ecosystems?

Why is photosynthesis limited to surface water in marine ecosystems? Visible light cannot penetrate deeply into the ocean, even when the water is clear.

What type of survivorship curves do humans typically display?

Humans and most primates have a Type I survivorship curve. In a Type I curve, organisms tend not to die when they are young or middle-aged but, instead, die when they become elderly.

What type of survivorship curves do humans typically display quizlet?

Humans and most mammals exhibit a type I survivorship curve. mortality is relatively constant throughout the entire life span, and mortality is equally likely to occur at any point in the life span. Many bird populations provide examples of an intermediate or type II survivorship curve.

What is the primary role of a decomposer in the chemical cycling of elements in the biosphere?

What is the primary role of a decomposer in the chemical cycling of elements in the biosphere? Decomposers break down large organic molecules into smaller, more accessible nutrients. All living things need carbon.

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What are most ecosystems powered by?

In most ecosystems, the ultimate source of all energy is the sun.

Why is photosynthesis limited to surface waters?

Why is photosynthesis limited to surface water in marine ecosystems? … Visible light cannot penetrate deeply into the ocean, even when the water is clear. (Most sunlight is absorbed within 10 meters below the surface and almost no light reaches below 150 meters.)

Why are certain species classified as invasive quizlet?

Why are certain species classified as “invasive”? They are introduced to new habitats where there are no predators and/or competitors.

Why do humans exhibit this type of survivorship curve?

Survivorship curves show the distribution of individuals in a population according to age. Humans and most mammals have a Type I survivorship curve, because death primarily occurs in the older years. Birds have a Type II survivorship curve, as death at any age is equally probable.

What are three ways invasive species are a threat to our environment quizlet?

Name direct ways invasive species pose threats.

  • Preying on native species.
  • Competing for food.
  • Carrying disease.
  • Preventing reproducing or killing young.

What survivorship curve is most typical of an opportunistic species?

The sigmoid growth curve is characteristic of most survivorship curves.

Why decomposers are important in an ecosystem?

Decomposers play a critical role in the flow of energy through an ecosystem. They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers.

Why are decomposers important in the carbon cycle?

Decomposers break down the dead organisms and return the carbon in their bodies to the atmosphere as carbon dioxide by respiration. In some conditions, decomposition is blocked. The plant and animal material may then be available as fossil fuel in the future for combustion.

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What would happen if decomposers were not part of the ecosystem?

Explanation: If decomposers were removed from a food chain, there would be a break down in the flow of matter and energy. Waste and dead organisms would pile up. Producers would not have enough nutrients because, within the waste and dead organisms, nutrients would not be released back into the ecosystem.