~20 points

which of the statements regarding the nitrogen cycle is true?

question 20 options:

nitrogen fixation is the process where atmospheric nitrogen is converted by bacteria into biologically usable forms

atmospheric nitrogen is absorbed through the leaves of plants

denitrification occurs when a nitrogen containing compound is produced from nitrogen in the soil

animals obtain nitrogen through the process of cellular respiration

Nitrogen fixation is the process where atmospheric nitrogen is converted by bacteria into biologically usable forms.

plant can not take nitrogen directly from the leaves.

The correct answer would be the first option.

Nitrogen cycle refers to the cyclic movement of nitrogen in which it travels through different spheres in nature.

Different processes involves in a nitrogen cycle are: nitrogen fixation, ammonification, nitrification, and denitrification.

Nitrogen fixation refers to the process by which atmospheric nitrogen is converted into compounds that can be used by plants. It is achieved by three means: atmospheric processes (such as thundering), industrial, and biological processes.

Biological nitrogen fixation refers to the type of nitrogen fixation in which atmospheric nitrogen is converted into nitrates or nitrites through nitrogen-fixing microorganisms.

For example, Rhizobium (symbiotic nitrogen-fixing bacteria), Azotobacter (free-living nitrogen-fixing bacteria, et cetera.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.