Animals and plants can't sustain life in sand because the sand doesn't absorb water or nutrients, and so by proxy, neither can the plants. Animals and plants can't sustain life in sand because the charge was over. Carly has had a tough week, and even her vacation can't quite snap her out of her funk. Honestly, you should try to reschedule your swimming training, trips to the beach, pool, or local. No beaches, no sand, no lakes, no swimming, no fun.