What are known as the
properties of substances
that describe a
substance yet does not
change that substance?
b. physical properties
a. chemical
properties
c
field properties
d. basic properties

A. Physiscal properties

Explanation - A substance have both physical and chemical properties that defines their state and ability to react with substances. Physical properties are those properties that provides the information about the substance but does not change its composition whereas chemical properties are those properties that are seen while the chemical reaction is taking place and the composition of the substance also changes.

Few examples of chemical properties are - toxicity, heat of combustion etc and that of physical properties are - color, density, odor, meting and boiling point etc.  

one centimetre is equal to 0.01 metres

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.