Phylum Protozoa, Subphylum Sarcodina

Explanation
The correct answer is "direct" because the term "direct" refers to a lifecycle in which the organism goes through a single host and does not require an intermediate host or vector for completion. In the case of Entamoeba, it undergoes a direct lifecycle as it goes through various stages (trophozoite and cyst) within a single host, typically a human.

Explanation
The correct answer is ingestion. Entamoeba, a type of amoeba, is transmitted through the ingestion of cysts. Cysts are a dormant form of the parasite that can survive outside the host and can be ingested through contaminated food or water. Once inside the body, the cysts can transform into the active form of the parasite and cause infection.

Explanation
Naegleria, an organism belonging to the Order Amoebida in the Subphylum Sarcodina, is known to reach the brain through the nasal cavity. It does so by utilizing the olfactory nerve, which is responsible for the sense of smell. This nerve connects the nasal cavity to the brain, allowing Naegleria to migrate from the nasal passages to the brain, leading to a potentially fatal condition called primary amoebic meningoencephalitis.

Explanation
Naegleria infections cannot be transmitted from one person to another. Naegleria is a type of amoeba that is commonly found in warm freshwater environments. Infections occur when the amoeba enters the body through the nose and travels to the brain. This typically happens when individuals engage in activities like swimming or diving in contaminated water. However, Naegleria infections are not contagious and cannot be transmitted from person to person through direct contact or respiratory droplets.

Explanation
The correct answer is Entamoeba. In the subphylum Sarcodina, the order Amoebida is commonly associated with the genus Entamoeba. This genus includes various species of amoebas that are known to be parasitic in nature and can cause diseases such as amoebic dysentery. Therefore, based on the information provided, Entamoeba is the most likely and appropriate answer.

Explanation
Naegleria is a type of amoeba that causes infection. The infection is contracted through the nasal cavity, which means that the amoeba enters the body through the nose. Once inside, it can travel to the brain and cause a severe and often fatal condition known as primary amoebic meningoencephalitis (PAM). This infection is rare but extremely dangerous, so it is important to take precautions to prevent exposure to Naegleria, such as avoiding warm freshwater sources like hot springs and poorly chlorinated swimming pools.

Explanation
The correct answer is Naegleria. Naegleria is the more scientific name for the "brain eating amoeba". This amoeba belongs to the order Amoebida within the subphylum Sarcodina.

Explanation
Entamoeba is a type of amoeba that is commonly found in the large intestine of vertebrates. This is because the large intestine provides a suitable environment for Entamoeba to thrive, as it offers the necessary nutrients and conditions for their survival. The large intestine is also where the majority of the digestion and absorption of nutrients takes place, making it an ideal habitat for Entamoeba.

Explanation
Subphylum Sarcodina refers to a group of protozoa that are known for their method of locomotion using pseudopodia, which are temporary extensions of the cell membrane. These pseudopodia help them move and capture their food. Therefore, the correct answer is "pseudopodia food."

Explanation
The correct answer is "mucosa, liver, lungs". The question is asking which organs can be affected by E. histolytica, specifically through invasion of the mucosa and spread via the circulatory system. E. histolytica is capable of invading the mucosa, liver, and lungs, and can affect these organs through its invasive abilities and spread through the circulatory system.

Explanation
The correct answer is "direct oral food insects vectors." In the subphylum Sarcodina, transmission is usually through direct oral ingestion of contaminated food or water. Insects can also act as vectors, carrying and spreading the disease-causing organisms.

Explanation
Entamoeba histolytica and Entamoeba dispar are two important species belonging to the Order Amoebida in the Subphylum Sarcodina. These species are parasites that primarily infect humans and dogs, although other primates may occasionally be infected as well.

Explanation
Cysts of the Order amoebida, similar to Giardia, have the ability to survive in the environment for long periods of time. However, they are vulnerable to high temperatures and desiccation.

Explanation
It is important to catch E. histolytica early before stages reach internal organs because once the parasite reaches the internal organs, it can cause severe damage and lead to serious health complications. By detecting and treating the infection early, the spread of the parasite can be prevented, reducing the risk of organ damage and improving the chances of a successful recovery.

Explanation
Mucosal invasion from E. hystolytica can lead to the development of dysentery, a condition characterized by bloody stools. This condition, known as amoebiasis, can be life-threatening if left untreated.