Choose all the answers that apply.

the cell wall

is only present in animal cells
supports and protects the cell
is made of cellulose
does not allow the transport of chemicals
is thick and rigid

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Which fact represents evidence for the big bang theory?