The evolution of birds' beaks is related to their diet. Which beak shape is most suitable for a bird that mainly feeds on nectar? A. Long and thin B. Short and thick C. Hooked D. Flat 相关知识点: 试题来源: 解析 A。解析:长而细的鸟喙适合吸食花蜜。选项B短而厚的鸟喙通常适合啄食坚果...
The evolution of birds is a long process.Which of the following is not a characteristic of bird evolution? A. Development of feathers B. Strengthening of wings C. Loss of beak D. Improvement of flight ability 相关知识点: 试题来源: 解析 C。鸟类在进化过程中,羽毛得到发展,翅膀不断强化,飞...
The evolution of the birds is far from being understood. The new fossil findings in China have only added to the controversy. Monkeys have had an arboreal life, jumping down from trees, for 45 million years, without having acquired wings or wing rudiments. Actually flight did emerge in the ...
In the course of the evolution of birds from reptiles, there was a( )of changes in the bone, muscles, and skin structures of the animals. A. rotation B. succession C. session D. suspension 相关知识点: 试题来源: 解析 B 考查名词辨析。rotation意为“旋转,转动,交替”;succession意为“...
在2019年的考试中,就有近16场涉及到了动物类考试,其中鸟类的相关话题每年都有出现,这里根据考点,主要给大家对鸟类起源(origin)和进化(evolution)等方面的知识进行介绍。 1. 起源(origin) 鸟类的起源主要有三种,分别是爬行动物(reptile...
The reptile is believed to be one of the first predators to use their wings to hunt prey - flying through Earth's prehistoric skies before the evolution of birds. 这种爬行动物被认为是最早使用翅膀捕猎的捕食者之一,在鸟类进化之前它们就已在史前地球的天空中翱翔了。
Birds engage in epic long-distance migrations and are able to travel from pole to pole. How in the world could an Amazonian river, even a large one, represent much of a barrier? Can’t birds simply fly across the river, reunite with their relatives and avoid becoming two different species...
They found that warmertemperatures were associated with a smaller body size.Co-author Benjamin Winger, who also studies the evolution and ecology of birds at University of Michigan, toldThe Washington Post that warmer temperatures have had an “almost universal effect" of shrinking other animals.The...
The whales’ limbs became flipperlike, and they lost the hair on their bodies, suiting them better to aquatic life.On the other hand, in the course of the evolution of birds from reptiles, there was a succession of changes in the bone, muscle, and skin structures of the animals. This ...
On the other hand, in the course of the evolution of birds from reptiles, there was a succession of changes in the bone, muscle, and skin structures of the animals. This wholesale restructuring of some reptiles over a period of thousands of years equipped the new animals to escape their ...