Question

The amount of the Earth’s Net Primary Productivity that human activity consumes, and the amount of the total ice-free land surface devoted to human activities_________.

Answer 1

The net primary productivity may be defined as the productivity rate lefts after the gross primary productivity reduced from the respiration. The plants acts as the producer in the ecosystem.

The humans directly or indirectly depend on plants and other animals for their productivity. The humans activity nearly consumes around 75% from the ice-free land surface. Around 25% of the planetary primary productivity is used directly by the humans for their activity.

Answer 2

25% of the planetary primary productivity

75% of the ice-free land surface.

Step-by-step explanation:

The researches and various studies have observed and analyzed that the amount of the Earth’s Net Primary Productivity that human activity consumed is almost 25% of the planetary primary productivity

and,

Out of all the land available on the planet Earth, Human land-uses occupies about 75% of the ice-free land surface.