The climatic change in the environment after the Ice Age brought about a change in plants and animals. Dietary patterns of human beings also began to change with time. Humans observed the behaviour of plants – the way seeds broke off the stalk, fell on the ground and new plants sprouted from them. They also started to protect the edible plants from plants and animals.Humans began to tame animals by leaving food for them near their shelter. Dogs were the first animals to be tamed. Humans also protected them from being attacked by other wild animals. Thus, a symbiotic relationship was shared between plants, animals and humans.