As a defense against air-pollution damage, many plants and animals______ a substance to absorb harmful chemicals.

Many animals ____ green plants for their foodA. base onB. look forC. depend onD.

( 翻译 ) The Non-Governmental Environmental Group was set up in 2012 to fight agai

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[单选题]［A］ New plants and animals then move into the area and begin to grow.［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels

[问答题]Air pollution is more serious than water pollution.

[问答题]Air pollution is more serious than water pollution.

It was long supposed _____ the main difference between animals and plants was th