What can explain why all organisms do not defend themselves against all natural enemies? a) not all defenses are effective against all natural enemies. b) not all organisms are attacked by the same natural enemies. c) defenses are costly to produce. d) all of the choices are correct.

Why do german shepherds shed so much

Quick asap will give brainiest ! what best describes the same pattern of tides on earth throughout the day? neap tides spring tides semidiurnal tides nocturnal tides

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d