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:
A. A resource that is so scarce (in restricted quantity) that it limits the size of a population is called a limiting factor. Any single resource can be a limiting factor to a population size. For example, the amount of water available can affect the number of plants that can grow in an area.
The first comprehensive lifespan view was developed by Erik Erikson. It is called the Erikson's stages of psychosocial development which identifies eight stages where a developing individual should be able to go through from infancy to adulthood. These stages are infancy (0 to 23 months), early childhood (2 to 4 years), preschool years (4 to 5 years), school age (5 to 12 years), adolescence (13 to 19 years), early adulthood (20 to 39 years), adulthood (40 to 64 years) and maturity (65 to death). In each stage, specific values, psychosocial crisis, significant relationship and existential question are being specified by Erikson.
Plants, Animals, Protists, Fungi,Archaebacteria, Eubacteria
