The cane toad was introduced in australia in the 1930s by farmers to control the beetles that fed on sugarcane crops. the cane toad can weigh up to a kilogram and eats almost any insect that fits in its large mouth.

though the cane toads were able to control the beetle problem, what threat did the toads pose to the native australian frog populations?

a. cane toads eat the eggs of the native frogs.

b. cane toads compete with the native frogs for food.

c. cane toads pollute the water in which native frogs breed.

d. cane toads mate with native frogs to form new species

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.