Matter can be classified according to physical and chemical properties. Scientists can observe physical properties without changing the composition of the substance, whereas chemical properties describe the tendency of a substance to undergo chemical changes (chemical reactions) that change its chemical composition.
PS, love your pfp :)
All prokarytoic cells replicate through binary fission.
The answer is b- the crocodile heart has three chambers.
Answer: seven
Explanation: the valence electrons are the numi of electrons found in the outermost shell of an element. The group of an element indicates it's number of electrons in the outermost shell while the number of shells occupied by electrons indicates the period.
Thus since the element is in group seven it has seven valence electrons.
Weathering is a destructive force because is moves and breaks up peices of rock and dirt.
