Which statements best describe measuring with a graduated cylinder? all that apply.
a. the liquid in the cylinder normally forms a concave meniscus.
b. the liquid in the cylinder normally forms a convex meniscus.
c. measurement is taken at the bottom of the meniscus.
d. measurement is taken at the top of the meniscus.
e. a graduated cylinder can be used to measure the volume of an irregular solid.
f. a graduated cylinder can be used to measure the volume of a regular solid.

A graduated cylinder also known as measuring cylinder is commonly used in laboratories to measure the volume of liquids. When a liquid is poured into the cylinder it forms a concave meniscus. The reading is measured by observing the value at the lower end of the meniscus. Graduated cylinder can only be used for liquids. 

Graduated cylinder can also be used to find the volume of a solid through a method known as water displacement. When a solid is immersed in the water, the water level rises. The volume of the solid is equal to the change in the level of water.

Therefore, the correct statements are:
a.The liquid in the cylinder normally forms a concave meniscus. 
c.Measurement is taken at the bottom of the meniscus.
e.A graduated cylinder can be used to measure the volume of an irregular solid.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

What are the choices