systematic investigation into and study of materials and sources. investigate systematically.

act or process bringing change. Acts of making or becoming something else. To replace something with another thing.

One more, but not this. One more added. additional person or thing of same type.

Zoo worker who takes care of the animals.

completely.

regulatory substance produced in organism and transported in tissue fluids such as blood. Chemical produced by the body to control functions.

Making food or drink go down to the stomach. cause or allow.

relating to or affecting muscles.

each of four divisions of year. Spring, Summer, Autumn (Fall) and Winter. To add pepper and salt to something.

Being what was wanted or needed. used to greet someone in polite or friendly way. Friendly greeting to someone who has arrived. To accept or receive something happily and gladly.

for reason that.

make idea or situation clear to someone by describing it in more detail.

forming or viewed as unit apart or by itself. individual items of clothing suitable for wearing in different combinations. cause to move or be apart.

group of people with common characteristic.

Equal to something in value, use or meaning. Thing like another in quality, quantity or degree.