A vacuum would retain the heat best, hence a thermos flask has a vacuum around it =-)
The flower that could survive the longest without water or sunlight would be a cactus. Now, you agreed to exotic gifts! Cacti have interesting looking shapes. You could get him a weird looking cactus. That would be funny, exotic and it would survive!
The opposite of retain (keep) could be lose or dispose of. The opposite of retain (hold) would be release, free, loosen, or unsecure.
The best one would be gardening soil
yes when i was pregnant my face was really puffy and i was carrying water all over my body so yes it is possible this could indicate a health problem though i would have it checked out
No. Salt causes the body to retain water, not water.
Could be long snapper For a kicker it would be the longest successful kick. For others it would indicate the longest carry or catch.
The answer is WATER!
water
The answer would depend on the ability of the water molecules to escape into the surrounding atmosphere. So what would help them escape? Dirty water would warm up in the sun faster, so you'd have a higher temperature and faster evaporation. The soapy water would bring oil to the surface and hinder the escape of the water molecules. So the order of which takes the longest would be: 1) soapy water, 2)regular water, 3)dirty water.
The past tense of "retain" would be "retained".
That would be a question you should ask the dealership, only they could answer that one.
Depending on the Na content you will likely retain a lot of water. You could probably live off the calories but would likely be deficient in a few minerals. Everything in moderation.