Bio 1.3 levels of biological organization

atom

smallest particle of an element, protons, neutrons, electrons

molecules

a combination of atoms, H2O

macro-molecules

protein, carbohydrates, nucleic acids, lipids

organelles

specialized structures within cells, make or store macro-molecules, ribosomes, rough ER, nucleus, mitochondria

cell

the smallest unit of life, basic unit of life, shape determines function

tissue

a group of cells performing a specific action, more than 1 cell, nervous ____

organ

a group of tissues that perform a specific function, 2 or more types

organ system

a group of organs working together to perform a specific function, digestive ____

organism

an individual form of life composed of many cells

population

all organisms of the same species living in the same area

community

multiple populations of different species living in the same area

ecosystem

living community (biotic) and the nonliving surroundings (abiotic) in the same area, tundra, tropics

biosphere

all of the different ecosystems on earth that support life, largest one