The present progressive tense should be used when translating which of the following sentences? 1. You are flying tomorrow.
2. We are boarding the plane.
3. The pamphlet is saying that there are life jackets under the seat.
4. He is going to pack his suitcase.

3. The pamphlet is saying that there are life jackets under the seat.

2 and 3 (1 and 4 are future progressive)

Explanation:

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.