The most common means of transmiting the Acquired Immune Deficiency Syndrome (AIDS) is

Plants tend to prevent overcrowding by means of efficient

The physical and climatic factors of a region primarily determine the

A step in the movement of energy through an ecosystem is a description that best fits the term

In a field experiment, the frequency of water leaf was observed to be 48 after 20 tosses of a 2m² quadrat. What is the density of the plants in the field?