his performances are the perfect combination of grace and theory-jaw-dropping athleticism この英文のtheoryはどういう意味ですか？理論と訳しても、文全体の意味がわかりません

NO3-の酸化数の求め方教えてください

一番〜四番の答えを教えて下さい。

0 ( ) him since rwas a chia had known 2 ① have know の こつ ウ に の winknow 2. The news ( ) us happy. ③④ allowed ② enabled ⑨ let ao 3. Please give ( ) when he comes here tomorrow. ① this book Tom ② Tom this book (⑧/ Tom to this book ④ tothis book Tom 4 Something is wrong ( ) your theory. ⑳ st ⑨② into ③ over ⑨ wth 5. This rock ( ) the face of an old man. ⑫⑳ looks at IO (@⑨ joks nite ④ looks forW

1文目の文構造を教えてください。

2/ ーツ の Natural selection is the process in which org4nisms that are better adapted to their environment are more jikely to survive and produce more ofRSpring. No environrmnent is perfect for every species. OBere are always jamits on available food, water, and space, as well as the.frequent threat of being attacked. @Pving thimgs always have to compete for resources and haye thus developed different mechanisms for survival Ke) Species that are more able to adapt to enyironmental pressures oyer time have a higher chance of survival @中 is believed that all animals can be traced back to a single common ancestor. The changes caused by natural selection do not happen | overnight 一 sometimes it can take a milion years for a change to take hold jm aspecies, Natural selection js sometimes caled "survival of the fttest' and it is the driving force behind the theory of evolution.

ヨウ素滴定で、でんぷんを加えて青紫色にしてから滴定するのはなぜですか？ ヨウ化物イオンが無色だというのは分かったのですが、それなら元々のヨウ素の赤褐色で反応させても良くないですか？ 文章が分かりづらくてすみません💦

ヨウ化カリウムが酸化されてヨウ素になったことで デンプンを加えて青紫色に呈色

Companies, such as Panasonic から始まる文を和訳お願いします！ 理由も教えてください

昌和 ーーーうカタタクー Students usually have only one chance/at securing a steady first job/ which aways Starts た本 8 Jane。fisk losing this chance. 」 』 30 Another theory is being suggested/to explain the declinen Japanese foreign BE Young Japanese are said to be growingmore introverted and reluctant to take risks/ This fearof the unknown/Among young Japanese fnay be preventing them/from venturing abroad. However/ this attitude may be misguided/because companies now Want morkers人th 35 an international outlook/As Japanese companies expand overseas/because of _ globalization gnd the strong yen/they seek employeesバ with international experience./ を RI 7 W ナ へ

285番なんですが、 これの答えは4番のyetです。 have yet to do 「まだ〜していない」の表現です。 これは理解できるのですが どうして1番のalreadyや2番、3番では 間違いなのかイマイチわかりません💦 教えてください😭

| 285) The new theory has( ) to be proved. 半 ① already ② become ③ been ④ yet (可学院大) 1 もていない。

BD:DC＝AB:ACがわかりません 教えてください！

Should universities focus more on theory or practical skills? これの答えと、理由2点ほど 答えてください！ 参考にします！

これのどーやったら AB:AC＝BD:CDになるのですか？？ 教えてください