Describe an abiotic factor that might limit the populations that can grow at certain depths in the coral reef ecosystems

Sunlight

Explanation:

An abiotic factor (non living) such as sunlight could limit populations as at deeper depths, there is a lack of sunlight because rays have difficulty penetrating through deep depths of water. This means that certain plants which require sunlight for photosynthesis may not be able to grow.

Of course, there are other abiotic factors such as temperature, water salinity, nutrient levels etc.

hope this helps :))

A

Explanation:

Hydroponics mainly utilizes water that is laced with all the nutrients plants need for growth. The water also contains antibacterial and antiviral properties that prevent plant diseases. Soil usually also provide anchorage to plants. In hydroponic they usually use ‘holed’ pipes through which the plant grow and anchor.  Avoiding soil ensures that the chances of pests and diseases are reduced, water is used more efficiently and there is more control of parameters such as pH.