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Xenobiology is the study of alien organisms, which became a government-paid job after the discovery of such organisms (albeit, non-sentient) during humanity's

There are several levels of sentience: Non-sentience refers to living organisms that lack the ability to think or perceive, often used in reference to

ordered 343 Guilty Spark to use a Gargantua-class transport to transport organisms — both living specimens and reduced genetic composites — from the greater

Team Slayer and the Flood game types. It was originally going to feature organisms called meat loops, muscle humps, gas sacks, smokers, and momma trees throughout

terrain. It is unclear whether bursters are converted from other existing organisms, or whether they are a kind of pure form specifically designed for the

being unlike that of most sentient beings, these trees were among the organisms killed by the test-firing of Installation 07. During the Siege of Charum

advanced Flood form created from the biomass of the most intelligent living organisms available, with the ultimate goal of creating a fully-functional Gravemind

the infection by the Covenant, is a species of highly virulent parasitic organisms that reproduce and grow by consuming sentient lifeforms of sufficient biomass

"Vase bushes" are plantlike like organisms found on Netherop. They resemble brittle, vase-shaped bushes with crystalline leaves. Upon receiving a gentle

Archmedicus. Lifeworkers also employed a type of Huragok specializing in organisms and medicine rather than machinery. As part of their effort to preserve

detrimental to humans in order to irradiate the nearby area and eliminate micro-organisms and bacteria that could cause infection. Halo: First Strike (First appearance)

mine. While an effective vector of infection against armored and shielded organisms as well as those equipped with atmospheric filters, a Pod infector is not

The green color could indicate the presence of some sort of algae-like organisms in the ice, but could also be due to other impurities, such as sediments

find their primary source of food, massive colony-swarms of krill-like organisms found in the planet's oceans. As cetaceans, paelosurs are air-breathers

Calcium is a soft gray alkaline earth metal that is essential for living organisms. Calcium is necessary for the mineralization of teeth, bones and shells

"Sail plants" are plantlike like organisms found on Netherop. They resemble tall plants with a single leaf, shaped like a diamond sail. Similarly to the

G'lul'g trees are carnivorus tree-like organisms found on Sanghelios. Farmers on the Sangheili homeworld use them to combat agricultural pests. The largest

highly vicious in their behavior and mercilessly devoured any biological organisms and technology they encountered. During the Forerunner-Flood war, Thanolekgolo

the Theran Crown could indicate the presence of some form of algae-like organisms, and thus life, on the planet. The discoloration could also be due to other

Halopedia by expanding it. A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs

referred to a genetic command imposed on an organism or species. Under the influence of a geas, an organism could be given a set of subconscious orders

was living, but in a way that was beyond the comprehension of biological organisms. Blurring the line between philosophy and science, neural physics was not

slipspace crates over small distances, the ability to transport living organisms remained out of reach for some time. Encounters with Promethean forces

Lifeworkers also used stasis fields to contain and preserve the various organisms they collected in the Conservation Measure. Related Forerunner technologies

Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to foodstuffs and fertilizers. Ammonia, either

they existed on a level beyond that of conventionally sapient biological organisms; they were described as "dreamers and makers whose minds transcended many

turrets have been set up. Serina: "Well, this is new... and scary. These organisms are...interesting. Our database has nothing on their origins - or, well

refer to the following: Flood - A species of highly virulent parasitic organisms that reproduce and grow by consuming sentient lifeforms of sufficient biomass

The Flood Super Cell's ability to consume and facilitate the use of an organism as an environment for its own prosperity closely parallels the abilities

The "tadpole" is a Flood organism encountered by a Covenant special operations team in the Forerunner gas mine in the atmosphere of Threshold. They were

feral aggression to coordinated conversion by creating specialised Flood organisms that network their individual intelligences. These key minds act as coordinators

iterations the interior was suspended in fractal slipspace, protecting organisms within from the Halos' destructive pulse. A prevalent variation of the

The Gigastaurozoa was an organism known to the Forerunners. Physically, the Gigastaurozoa resemble the Huragok, albeit with a significant difference in

example of the Forerunners' mastery of nanotechnology. Huragok are synthetic organisms, having no true tissues or organs but instead being composed entirely of

waiting for a potential food source to arrive. Upon contact with a suitable organism, they begin to mutate it in such a way as for it to begin incubating the

assemblages, known as subsistence gestalts. Each Lekgolo is an individual organism, about 1.4 meters long, with its own central nervous system. Lekgolo are

models of the Halo Array, which do not completely destroy the biomass of an organism and requires a solute to instantly decay the biomass into their component

within the Sentinel Wall. Although weak, one of these beams can harm an organism if they come in contact with it. Constructors can also play the role of

that destroys the nervous system of any life form within range. Simpler organisms lacking a neural system are unaffected, along with inanimate structures

some cases, biological beings. These remarkably helpful and docile pseudo-organisms are exceedingly patient, rarely communicate with other species, and are

the sector under lockdown, Serina spends the following days examining the organism' actions for future interest to the UNSC, as well as to quench her own

Blood is used to transport nutrients through the body of a multicellular organism. In the case of humans, it uses a compound called hemoglobin to transport

Flood behaving as mindless zombie-like creatures to incredibly intelligent organisms with the ability to operate starships and other advanced technology. The

reinforcements, prompting the first group to rescue the second from the organism. The group reunited, then continued to the Citadel, where Usze would remark

San'Shyuum, the Flood would frequently capture, infect, and merge host organisms into unified masses with an encompassing intelligence; Graveminds. Soon

Cryonics is the science of preserving a human or other organism in stasis for extended periods of time. It is often mistaken for cryogenics, which is merely

was a 49% chance that the process would lead to the destruction of all organisms on the world. The two Sangheili hoped that they rest of the Ussans would

different from the human method of "transcribing" the brain of a sentient organism. However, at least one monitor, 343 Guilty Spark, was created using the

fighting in the Battle of Installation 04, the Covenant discovered the Flood organism and Forerunner constructs, which severely hampered their efforts to control

Sangheili in their opposition, however. As artificial sentient nanomechanical organisms, Huragok were created by the Forerunners. They have no interest in religion