Question

challenge question
imagine you are a scientist creating a new ecosystem in space. what 3 living and 2 non-living components would you include, and why?
(use complete sentences and be specific.)

Explanation:

Living Components:

1. Algae (e.g., Chlorella): Algae are photosynthetic organisms, so they can convert light energy (from artificial or space - derived light sources) into chemical energy through photosynthesis. This process produces oxygen, which is essential for the survival of aerobic organisms in the ecosystem, and also creates organic matter that can serve as a food source for other organisms.
2. Nematodes (e.g., Caenorhabditis elegans): These are small, simple multicellular animals. They can feed on the organic matter produced by the algae or other decomposing materials. Their presence helps in the cycling of nutrients as they break down organic matter and release nutrients back into the system, and they also serve as a food source for potentially larger organisms if introduced later.
3. Bacteria (e.g., Rhizobium - like bacteria, modified for space): Bacteria can play multiple roles. Some can fix nitrogen (if the ecosystem is designed to have a nitrogen cycle), converting atmospheric nitrogen (or nitrogen - rich compounds in the space environment) into a form usable by plants (like the algae). Others can act as decomposers, breaking down dead organic material from the algae and nematodes, recycling nutrients such as carbon, nitrogen, and phosphorus back into the ecosystem.

Non - living Components:

1. Water (in a recycled, closed - loop system): Water is a fundamental requirement for all living organisms. It is a solvent for biochemical reactions, helps in the transport of nutrients and waste products within organisms, and is involved in processes like photosynthesis (in algae) and respiration. In a space ecosystem, water needs to be recycled to be sustainable, as resupplying water from Earth would be difficult.
2. Artificial Light Source (e.g., LED lights with a spectrum similar to sunlight): Since space lacks the natural sunlight that Earth - based ecosystems rely on, an artificial light source is necessary. The light is needed for photosynthesis in the algae. The spectrum of the light should be adjusted to match the wavelengths that are most effective for photosynthetic organisms, ensuring that the algae can efficiently produce oxygen and organic matter.

Answer:

Living Components:

1. Algae (e.g., Chlorella) would be included because they perform photosynthesis to produce oxygen and organic matter, which are essential for the ecosystem's energy and gas balance.
2. Nematodes (e.g., Caenorhabditis elegans) would be included as they help in nutrient cycling by consuming organic matter and can serve as a food source for other organisms.
3. Bacteria (e.g., modified Rhizobium - like bacteria) would be included to fix nitrogen (if needed) and decompose organic matter, recycling nutrients back into the ecosystem.

Non - living Components:

1. Recycled water would be included as it is essential for biochemical reactions, nutrient transport, and processes like photosynthesis and respiration in living organisms.
2. An artificial LED light source (with a sun - like spectrum) would be included to provide the energy needed for algae to perform photosynthesis, as space has no natural sunlight for the ecosystem.