на расстоянии 50 см от собирающей линзы с фокусным расстоянием 25см находится свечка. Какова оптическая сила?

Приведите примеры мхов от 3 до 5....ооооченьь надо!!

Примеры групп организмов по отношению температура свету  и  влажности

Фонетический разбор слова лягушки, уют.

Put the verbs in brackets into the correct tense to form conditionals.

1.(приммер) If she had saved (save) some money, she would have been able to buy a car.

2. I ...............(visit) him if I knew he was in hospital.

3. He'd have passed the exam if he .............. (study) harder.

4. Sara will get lost if she ........... (not / take) a map with her.

5. Dave will miss the bus if he ............. (not / leave) on time.

6. I ............. (go) to the party if I hadn't been ill.

7. If I'd known it was his birthday, I ............ (send) him a card.

8. He ............ (not / break) his leg if he hadn't  fallen off the ladder.

9. If you hadn't been in such a hurry, you ........... (not / leave) your keys.