1). Heart transplantation in animal was first achieved in 1959.
2). The first human heart transplant was performed by professor Christian Bernard in South Africa in 1967.
3).The two hormones Adrenaline & thyroxine regulates Heart beat.
4).Organic substance which, in very small amount controls growth and development are called Hormones.
5). Poison Glands of Snakes are homologous to salivary glands of Vertebrates.
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