Sunlight, oxygen, water, nutrients/food, and stable conditions such as temperature
"The tigers <u>had been lying</u> in wait all morning."
The correct answer is perfect progressive tense.
Perfect progressive tense describes actions that took place in the past, and is still happening in the present, and/or will continue happening.
Progressive tense is an action that takes place in the past OR present Or future.
- The tigers lied down in wait this morning. (past)
- The tigers are lying down this morning. (present)
- The tigers will lie down. (future)
Perfect tense that started in the past and continues now.
- I have learned a lot this semester. (present perfect)
- I had learned a lot in elementary school. (past perfect)
- I will have learned a lot when I finish college. (future perfect)
