24. Which of the following is an example of the type of organism described in lines 2-5?
A kind of ant that feeds on the sweet juice exuded by the twigs of a species of thorn tree that grows in dry areas.
A kind of fish that, after growing to maturity in the ocean, returns to fresh water.
A kind of flower that has markings distinctly perceptible in ultraviolet light to the species of bee that pollinates the flower.
A kind of tree with seeds that germinate readily only in a sunny spot and then develop into mature trees that shade the area below them.
A kind of butterfly, itself nonpoisonous, with the same markings as a kind of butterfly that birds refuse to eat because it is poisonous.
25. It can be inferred from the passage that which of the followings is true about Asterionella plants in Lake Windermere?
They are not present except in early spring.
They contribute silica to the waters as they grow.
They are food for other organisms.
They form a silica-rich layer on the lake bottom.
Their growth peaks in the spring.
26. The passage indicates that organisms frequently have the strongest effects on their environment in
oceans, since oceans contain the largest organisms living on Earth
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