[問題]GWD18-20

[ezong]

Which of the following most logically completes the reasoning?
Either food sarcity or excessive hunting can threaten a population of animals. If the group faces food scarcity, individuals in the group will reach reproductive maturity later than otherwise. If the group faces excessive hunting, individuals that reach reproductive maturity earlier will come to predominate.Therefore, it should be possible to determine whether prehistoric mastodons became extinct because of food scarcity or human hunting,since there are fossilized mastodon remains from both before and after mastodon populations declined,and__________.

A.there are more fossilized mastodon remains from the period before mastodon populations began to decline than from after that period
B.the average age at which mastodons from a given period reached reproductive maturity can be established from their fossilized remains
C.it can be accurately estimated from fossilized remains when mastodons became extinct
D.it is not known when humans first began hunting mastodons
E.climate changes may have gradually reduced the food available to mastodons

answer: B
我不太懂題目的意思...
麻煩大家幫我解答這一題....
謝謝!!

[fsab00037748]

題目的意思是說(以下非翻譯喔,講概念)

如果一種動物面臨的食物減少的危機, 那麼該物種就會晚點達到繁殖狀態
如果一種動物面臨被捕獵過多的危機,那麼該物種就會早點達到可繁殖的狀態
所以用這種方法就可以知道prehistoric mastodons 絕種是因為食物不足,
或因為被人類獵殺過多

since, 有mastodon數量減少之前與之後的化石 和________

從題目前提知道 , 達到生育成熟狀態的時間早或晚可以判斷出來 物種絕種的原因
所以答案B: the averge age....就可判斷嚕^^


ps.好像OG裡面有篇文章講到說 動物如果被捕殺過多, 就會趕快生趕快生
以維持該物種不被滅種 ; 但如果遇到環境變化,食物變少,
就會晚點生,生少點 , 免得內耗.....就是這個概念嚕