Answer: A natural killer cell (NK) is a type of lymphocyte that has an activating and inhibitory receptors extending from its plasma membrane
Explanation: A natural killer cell (Nk) is a type of lymphocyte (a white blood cell) that has an AC and inhibitory receptors. It plays a major role in host rejection of both tumours and virally infected cells. It contains specifical protein such as perforin and granules.
Answer:
B) ecosystem, community, population, individual
Explanation:
An ecosystem is the most inclusive level of the ecological system for it comprises of both living and non living organisms that are joined together through the nutrient cycle and the flow of energy. An ecosystem is made up of different communities.
A community comprises of organisms of different species that live and interact with one another in the same habitat.A community is formed by different populations.
A population is made up of many individuals of the same species that can interbreed to give rise to viable offsprings and end up forming a community.
An individual is a living organism that cannot interbreed with other individuals giving rise to a viable offspring.It is the least level in the ecological organisation.
The answer is b it occurs in plant animals and bacteria
Answer:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
