What general name is given to the cells that make up most living things?
Name 2 methods of cell reproduction?
mitosis and meiosis
What does photosynthesis create?
glucose and oxygen
What do cells create when they respire?
carbon dioxide and water
What type of organism could have developed spontaneously in earths early atmosphere?
What is teh dominant invertebrate species?
insects dominate species
What types of organisms make up the Protistae kingdom?
What three main functions do bacteria form?
disease causing, digestion assistance (substances in intestines, oil spills), Decomposers part of chemical cycles (nitrogen, carbon, and processes alchol, cheese, antibitotics
How many pairs of chromosomes do himans usually have?
23 pairs = 46 complete number
What part of circulatory system carries blood back to the heart?
What part of cell transmits signals?
dendrites and neurons
What does the endocrine system consist of?
glands and hormones
What survival options do subdominant individuals have in an ecosystem?
changes in behavior eat leftovers migrate specialize clinb camaflauge
How do plants and animals balance the carbon cycle?
plants produce oxygen which animals need. Animals produce CO2 which plants need.
What causes seasons on the earth?
the tilt of the earth
What percent of earths atmosphere is nitrogen? and oxygen?
nitrogen 78% and oxygen 20%, WATER VAPOR 1%, OTHER GASES 1%, NITROGEN DOES NOT COMBINE WELL WITH OTHER GASES, MORE NITROGEN
About what percentof the earths surface is covered by water?
3/4 71% or 75%
In which direction does Coriolis force pull air in the southern hemisphere?
rotation of earth left
About what percent of sea water is salt?
How are metamorphic rocks formed?
pressure and heat
What subatomic particles do atoms consist of?
protons, neutrons and electrons
When do chemical reactions occur?
occur when bonds form or break
Does a bodys mass vary?
What 2 factors determine a bodys velocity?
distance and time
How does Newtons second law of gravity describe the relationship between mass and accleration?
Force= mass x acceleration
What type of energy does fuel in a cars gas tank represent?
What must happen for work to occur?
What method of transfer moves heat from a heating pad to a persons back?
What determines a waves frequency?
# of vibrations per second
What 3 things may happen when light strikes a surface?
refelction, refraction, and absorption
Through which type of medium does sound travel most quickly?
Where is magnetic North pole?
NE of canada
Name 3 types of energy radioactive material can release?
alpha, beta, gamma