State the reason why most of the terrestrial animals’ fertilization takes internally.
Answers
Biology Dictionary
Tertiary Consumer
By:
BD Editors
Reviewed by: BD Editors
Last Updated: April 28, 2017
Tertiary Consumer Definition
A tertiary consumer is an animal that obtains its nutrition by eating primary consumers and secondary consumers. Usually tertiary consumers are carnivorous predators, although they may also be omnivores, which are animals that feed on both meat and plant material.
Function of Tertiary Consumers
Within any ecosystem, the energy that is present within its organisms is passed through a food chain or food web. Each organism in a food chain occupies a particular position called a trophic level, whereby animals consume other animals in lower trophic levels and are eaten by those in higher trophic levels.
Tertiary consumers often occupy the top trophic level, and so are predated by no other animals; in this case they are called “apex predators”. However, when they die their bodies will be consumed by scavengers and decomposers.
Sometimes in a food chain there is an apex predator above the tertiary consumer. However, energy is used up and is lost as heat as it is transferred through each of the trophic levels, which results in a low availability of energy in the higher levels (this can be viewed as an energy pyramid). It is therefore common to only have four trophic levels, and for the tertiary consumer to hold the ecological function of the apex predator.
Ecological Pyramid
Ecological Pyramid
Species in the highest trophic levels play a very important role in ecosystems. They control populations or alter the behaviour of animals in lower trophic levels. Animals in lower trophic levels may be carnivores, herbivores or omnivores, and when their populations are limited it relieves either predation or grazing pressure on the trophic levels below them. This keeps ecosystem dynamics in balance. For example, if a population of foxes becomes too large it could put pressure on rabbit populations. By predating the foxes, a tertiary consumer, such as a hawk, keeps the populations in check and reduces the amount of rabbits that are consumed by the foxes. This is called a trophic cascade.
Trophic Cascade
The image shows an example of a trophic cascade. When the predator is present the deer population is controlled, however, if predators are removed deer populations grow and this can affect the vegetation of an ecosystem.
Examples of Tertiary Consumers
Big Cats
All big cats, such as tigers, lions, pumas and jaguars are tertiary consumers. They are also all apex predators, meaning they have no predators in their natural environment—an exception to this is the leopard, which is occasionally predated by lions and tigers, with which they share habitats.
Answer:
The environment on terrestrial land keeps on changing than that of the marine environment. So inorder to increase the survival chance of the fertilization (internal environment is nearly constant) terrestrial animals’ fertilization takes place internally.
please mark me the brainliest
please
please
please
