The diagram below shows a food web in a woodland. If a certain organism is a secondary consumer, what best explains its position in the food web?

a
X, because organism X feeds on producers

b
Y, because organism Y feeds on producers

c
X, because organism X feeds on a carnivore

d
Y, because organism Y feeds on a herbivore

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary