How does thermal energy transfer when a room is heated by a furnace? ! a. hot air is absorbed by the objects in the room; cold air expands and rises. b. hot air is circulated through the room; the hot air rises, and cold air falls. c. hot air makes direct physical contact with the objects in the room and rises. d. hot air is transmitted by electromagnetic waves; the hot air rises and falls.

You have 2 plants of the same type and same size, same amount of leaves. one of them is put inside the house and the other one is put in the balcony. you water them saturday, one plant with 200 ml and the other with 400 ml of water. which one of your plants need less water? explain.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos