Which of the following statements is true? a. biotic factors are nonliving components of an ecosystem. b. abiotic factors are living components of an ecosystem. c. the available space in an ecosystem is an abiotic limiting factor. d. the available water supply in an ecosystem is a biotic limiting factor.

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