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A2 biology help please. Not every good at learning about ‘the natural environment and species survival’.

For a project, I need to know the ecological niches of these 4 organisms, but I don’t understand what an ecological niche is. Can someone please explain to me the types of niches? Please don’t tell me that it’s a project and to do it on my own, because I have been searching for a really long time now, and can’t seem to find it in my notes or the internet.

Design an organisms that occupies either a low energy or high energy niche.
Your answer should describe how the organism copes with the following environmental stresses:
Calories
Oxygen and Carbon Dioxide exchange
Water balance
Metabolic waste
Infectious agents
Extremes in temperature
A good approach would be to think about the way the organism responds to these stresses and think about the systems involved.
Good luck
DO NOT USE AN EXISTING ORGANISMS
Thank you for the help.

a.populations
b.organisms
c.biomes
d.niches
e.abiotic resources

A. its number of chromosomes
B. when it reproduces
C. its trophic level
D. the humidity and temperature it prefers

Hi. I need to do a report on starfish and include the following about them:
-Niche
-Adaptations
-Explain the organisms interaction between it’s species and other species
-Identify location in food web and tropic level
-Identify factors that effect the organisms success in the wild
If you could provide information or links that include this information that would be great. Thank you.