Answer:
osculum.
Explanation:
The large central opening in the parazoan body is called the osculum. In short, the protozoan body usually has bag-like structures. The inner cavity is called the atrium. In the upper part of the atrium there is an opening, the osculum, which serves to eliminate water with substances unnecessary for protozoan nutrition and with debris resulting from cellular activity.
A facultative parasite refers to a species, which may resort to parasitic activity, but is not completely dependent on any host for finishing its life cycle. Therefore, the growth of Armillaria fungi inside a tree's roots, making the tree to rot, but will survive even if the tree dies, is an example of facultative parasitism.
An obligate parasite refers to a parasitic species, which cannot finish its life-cycle in the absence of a suitable host. Therefore, rickettsia bacteria's tendency to surviving only in a eukaryotic cell is an example of obligate parasitism.
A long-term symbiosis or biological association in which members of one species attain benefits while those of the other species is neither harmed nor are benefited is known as commensalism. Hence, a pseudoscorpion, a kind of arthropod hiding under the wings of beetle for protection and transportation, however, it does not affect the beetle is an example of commensalism.
Predation refers to a biological association, where one species, the predator, kills and consumes another species, known as prey. A freshwater amoeba feeds on bacteria in the water is an example of predator and prey.
B. Chitin
that' because both animals and fungus are eukaryotic and heterotrophic, so they share same characterstics in terms of feeding and cellular structure. In addition to both share the same protist supergroup, which is (Unikonta).
The strip cropping is a method of the farmers that is used whenever the slope may be too sharp and steep or if there is no other alternative way or method of preventing such incidents, such as possible soil erosion.
Explanation:
leukocytes are white blood cells. mainly 4 killing bacterial infections.
