Biology Unite 1 Characteristics and classification of living organisms

movement

an action by an organism or part of an organism causing a change of position or place

respiration

the chemical reactions in cells that break down nutrient molecules and release energy for metabolism

sensitivity

the ability to detect and respond to changes in the internal or external environment and make appropriate responses to it

growth

a permanent increase in size and dry mass

reproduction

the processes that make more of the same kind of organism

excretion

the removal of the waste products of metabolism and substances in excess of requirements

nutrition

the taking in of materials for energy, growth and development

species

a group of organisms that can reproduce to produce fertile offspring

binomial system of naming species

an internationally agreed system in which the scientific name of an organism is made up of two parts showing the genus and species

cell

the basic unit of life

tissue

a group of similar cells working together to perform the same function

organ

organ, a structure of different tissues performing a specific function

organ system

groups of organs with related functions working together to perform a body function

organism

living thing, which is made up of one or more organ systems that work together to sustain life