Kingdom Animalia

The correct answer is "a. Sel amebosit." In Porifera, sel amebosit berfungsi sebagai pengangkut zat makanan dan zat sisa metabolisme. Sel ini bertanggung jawab untuk mengambil partikel makanan dan mengangkutnya ke seluruh tubuh spons. Sel amebosit juga membantu dalam pembuangan zat sisa melalui proses fagositosis. Selain itu, sel amebosit juga berperan dalam sistem pertahanan spons dengan mengambil dan menghancurkan patogen yang masuk ke dalam tubuh spons.

Spongilla is the correct answer because it is a type of Porifera that is commonly used as a sponge in sponge factories in America. This suggests that Spongilla has qualities or characteristics that make it suitable for use as a sponge in industrial settings. The other options, Pheronema, Acrophora, and Sycon, may also be types of Porifera, but they are not specifically mentioned as being used in sponge factories in America.

The correct answer is a. Dapat berenang bebas. This is because medusas are the free-swimming stage of the Coelenterata life cycle. They have a bell-shaped body with tentacles and are capable of independent movement in the water.

The correct answer is c. Medusa. Medusa is a stage in the life cycle of Coelenterata where they are able to move freely and engage in reproduction. This stage is characterized by a bell-shaped body with tentacles hanging down, allowing them to swim and capture prey. The other options, such as Planula, Polip, and Skifistoma, represent different stages in the life cycle of Coelenterata but do not involve the ability to move freely and reproduce.

The common characteristics of members of the Coelenterata phylum are marked by having a gastrovascular cavity. This cavity serves as both a digestive and circulatory system, allowing for the digestion and distribution of nutrients throughout the organism's body. This characteristic is unique to the Coelenterata phylum and distinguishes it from other phyla.

The correct answer is c. Daktilozooid, gastrozooid, gonozooid. This is because Physalia Pelagica is a type of Portuguese Man o' War, which is a colonial organism made up of specialized polyps. The daktilozooid is responsible for capturing prey, the gastrozooid is responsible for digestion, and the gonozooid is responsible for reproduction.

The student found an animal with a flat, elongated body and longitudinal stripes, living on land, and measuring about 6 cm in length. Based on these characteristics, it is likely that the animal belongs to the Turbelaria group.

Autoinfeksi dapat terjadi pada cacing Oxyuris vermicularis. Autoinfeksi adalah kondisi di mana parasit atau infeksi kembali masuk ke dalam tubuh host yang sama. Oxyuris vermicularis adalah cacing usus yang umumnya ditemukan pada manusia dan dapat menyebabkan infeksi cacing usus. Jika tidak diobati dengan baik, cacing ini dapat menghasilkan telur yang kemudian dapat menular kembali ke tubuh host yang sama melalui tangan yang terkontaminasi atau melalui udara. Oleh karena itu, autoinfeksi dapat terjadi pada cacing Oxyuris vermicularis.

Cells called nematocytes are found in the class Hydrozoa. Nematocytes are specialized cells that contain stinging structures called cnidocysts, which are used for defense and capturing prey. Anthozoa, Calcaera, and Scyphozoa are other classes of cnidarians, but nematocytes are not found in these classes. Therefore, the correct answer is c. Hydrozoa.

Ostia are cells in Porifera that control the opening and closing of pores. They regulate the flow of water into the sponge, allowing for filter feeding and the exchange of gases and nutrients. Ostia are essential for the survival and functioning of Porifera.