All the organisms living in a particular area plus all physical components of the area whth which organisms interact (air, soil, water, sunlight) is the:
Ecosystem
What are the 3 domains of life?
Domain Bacteria
Domain Archaea
Domain Eukarya
Atoms want to fill their outer:___________ ________
Electron Shell
Approximately what is the PH of human blood?
7
PH stands for:
Potential of Hydrogen
What are the two basic kinds of cells:
Prokaryotic
Eukaryotic
What type of cell contains a nucleus?
Eukaryotic
What are the characteristics of a Eukaryotic cell?
Has a nucleus, organelles, membrane. forms of life such as plants, animals and fungi are composed of eukaryotic cells
What are the characteristics of a prokaryotic cell?
No nucleus, has a membrane, bacteria is commonly a prokaryotic cell
The chemical basis for all of life's kinship?
DNA
What are the two main approaches to learn about nature?
Discovery science
Hypotheses-Based Science
What is a hypothesis?
A proposed explanation for a set of observations.
What are the 4 elements in the human body?
Oxygen
Carbon
Hydrogen
Nitrogen
What is a substance consisting of two of more different elements combined in a fixed ratio?
Compounds
Atoms consis of _________ __________ ________
Protons
Neutrons
Electrons
What is the charge of a proton
+ (positive)
What is the charge of a neutron?
Neutral (no electrical charge
What is the charge of an electron?
- (negative)
The atom's central core is called:
nucleus
What determines an atom's atomic number?
number of protons
What does the number of protons of an atom give us?
The atomic number
What is an atoms mass number?
The sum of the atom's protons and neutrons
The mass of a proton and the mass of a neutron are expressed in an unit of measure called: