Answer:
Hours of sleep of college students
Explanation:
In a typical experiment or scientific study, there are usually two types of variables that gives the study direction. We have dependent and independent variable.
The independent variable which is the “cause”, is the variable that can be manipulated by the researcher to find the possible effect it would bring on a dependent variable.
The dependent variable which is the “effect”, is the variable that changes as a result of the manipulation of the independent variable. It is dependent on the independent variable.
In the study conducted by the psychologists, the independent variable is the hours of sleep of students, which has a direct effect on the grades achieved by students (dependent variable). The grades achieved by students (dependent variable) is dependent or determined by the hours of sleep (independent variable) of students.
The Toxic Substances Control Act requires that, before manufacturing a new chemical in bulk, manufacturers must submit a pre-manufacturing report’ to the EPA in which the environmental and human health impacts of the substance are assessed (including those that may derive from the ultimate disposal of the chemical). Depending on the results of the assessment, the manufacturer may be required to test the effects of the product on living things. Following the results of the testing, a product’s uses may be restricted or a product may be kept off the market altogether.
Answer:
1) cortical epithelial cells; (2) macrophages and dendritic cells
Explanation:
T cells, also known as T lymphocytes, are a fundamental type of cell of the immune system that determines the specificity of the immune response to specific foreign particles (antigens). T cells are produced in the Thymus (it is for that reason that they are called T cells) and then circulate throughout the bloodstream in order to recognize specific antigens in association with major histocompatibility complex (MHC) molecules on the surface of antigen-presenting cells (APC), such as macrophages and dendritic cells. T cells undergo positive and negative selection: 1- positive T-cell selection refers to the process by which T cells bind cortical epithelial cells that express Class I or Class II MHC molecules with enough affinity to get a survival signal; whereas negative selection occurs when T cells bind to macrophages and dendritic cells that express MHC specific receptors with a strong enough affinity to get an apoptosis (programmed cell death) signal.
Answer:
Juan should try to surround himself with people who have empathy and are kind to him.
Explanation:
supportive people can affect Juan by decreasing the amount of stress, and they can help him out of any situation such as his friends vaping or stealing.
