Whale is

The primary succession in a sere is

What changes are observed in energy at successive trophic levels in a food chain?

Which of the following biochemical cycles has a gaseous phase?

In the phosphorus cycle, phosphate becomes available by weathering of rocks first to

What is true about the phosphorus cycle?
$I.$ Rocks are the natural reservoirs of phosphorus.
$II.$ Weathering of sedimentary rocks makes phosphate available to the soil.
$III.$ Herbivores and carnivores obtain phosphorus from plants directly or indirectly.
Choose the correct option.