The log stayed quite still on the smooth lake and one by one more frogs came up to take a look. They swam closer and closer until at last they leaped right on top of it , quite forgetting that they had ever been frightened. Young frogs began to use it as a diving board; old frogs...
The log stayed quite still on the smooth lake and one by one more frogs came up to take a look. They swam closer and closer until at last they leaped right on top of it , quite forgetting that they had ever been frightened. Young frogs began to use it as a diving board; old frogs...
O Frog calls are difficult to interpret because old Frogs and young Frogs in cool places produce the same song, and near Frogs that are old and weak can sound like fit young Frogs calling from a distance. O Because calling is such a tiring activity for Frogs, it is used to communicate ...
1:The calling or singing of frogs plays an important role in their reproduction—specifically, inhelping individuals find and select mates. Sound has many advantages as a communication signal.When sounds are broadcast, the auditory receptors do not need to be in a particular orientationrelative to ...
3. Frogs lay eggs in water, and their young, called tadpoles, undergo metamorphosis to become adult frogs. 青蛙在水中产卵,它们的幼体叫做蝌蚪,通过变态过程变成成年青蛙。 4. Many cultures around the world consider frogs as symbols of good luck or fertility. 世界各地的许多文化将青蛙视为好运或生育...
Seemingly young sex chromosomes may thus carry old-established sex-determining genes, a result at odds with the view that sex chromosomes necessarily decay until they are replaced. This raises intriguing perspectives regarding the evolutionary dynamics of sexually antagonistic genes and the mechanisms ...
O Frog calls are difficult to interpret because old Frogs and young Frogs in cool places produce the same song, and near Frogs that are old and weak can sound like fit young Frogs calling from a distance. O Because calling is such a tiring activity for Frogs, it is used to communicate ...
1.any tailless stout-bodied amphibian of the order Anura, including the smooth, moist-skinned frog species that live in a damp or semiaquatic habitat and the warty drier-skinned toad species that are mostly terrestrial as adults. 2.Also calledtrue frog,ranid.any frog of the widespread family...
Researchers observed adult Goliath frogs in the wild and found that they move rocks weighing up to 2kg while building ponds for their young, which they then guard. Goliath frogs themselves weigh up to 3.3kg and their bodies reach over 34cm, without including their legs. ...
【答案】C【解析】从第三段的第一行As well as being strong, the frogs are also anxiousparents, raising their young babies in ponds awayfrom fast-flowing rivers and possible enemies可以看出它们创造新的巢是为了保护它们的宝宝4.【答案】C【解析】从最后一段可以看出本文的主要目的是为了呼吁人们保护歌...