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

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

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

[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

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