Among them is one nationwide frog-watching program in the US In that program, people learn the breeding calls of the local toads and frogs. They then report their data back to a national data base. If you don't know the excellent time to observe frogs, choose the early spring. It is ...
In that program, people learnthe breeding calls of the local toads and frogs. They then reporttheir data back to a national database.If you don't know the excellent time to observe frogs, choose the early spring. It is the time fortheir annual renewal of life and they are most active ...
You cows that I see before me, how many thousands of gallons of milk have you given during this last year? And what has happened to that milk which should have been breeding up sturdy calves? Every drop of it has gone down the throats of our enemies. And you hens, how many eggs ...
A. food only B. shelter only C. breeding grounds only D. food, shelter, and breeding grounds 相关知识点: 试题来源: 解析 D。许多动物依赖森林获取食物、住所和繁殖地。文章提到“Many animals, birds, and insects depend on forests for food, shelter, and breeding grounds.”,所以答案是 D。反...
You cows that I see before me, how many thousands of gallons of milk have you given during this last year? And what has happened to that milk which should have been breeding up sturdy calves? Every drop of it has gone down the throats of our enemies. And you hens, how many eggs ...
Why do some animals mate with one partner rather than many? Here, I investigate factors related to (i) spatial constraints (habitat limitation, mate availability), (ii) time constraints (breeding synchrony, length of breeding season), (iii) need for parental care, and (iv) genetic ...
Two methods are presented that use information from a large population of commercial animals, which have not been genotyped for genetic markers, to calculate marker assisted estimates of breeding value (MA-EBV) for nucleus animals, where the commercial animals are descendants of the marker genotyped...
are still fighting the effects of aliens introduced hundreds of years ago For example, Gough Island in the South Atlantic Ocean is a breeding ground for albatrosses (信天翁)that have been nesting there for centuries .But in the 19th century, mice from passing ships were brought to the island...
and mammals.Losses in these groups would have been about 20 percent greater had it not been for recent actions of protection.just four of these birds of prey were left in the world.Through a special breeding program,) have benefited greatly from recent conservation efforts as well.They were ...
美 英 n.动植物 英汉 n. 1. 动植物