fe stages D) dersat hollow nerve chord. E) four-chambered heart 22. Which is NOT

Question

fe stages D) dersat hollow nerve chord. E) four-chambered heart 22. Which is NOT characteristic of all mammab? A) a four-chambered heart that prevents miking of onyeenated and deoryenated bood 8) giving birth to live young (viviparous) C) having hair during at least some period of D) having glands for produce nourlshing milk for offspring E) having a diaphragm to assist in venbilating the lungs. life. 23. Which of the following is a flagellated cell which sweeps water theough a sponge's body? Al choanocyte C) archaeocyte 0] neuron E) chondrocyten which one of the following is NOT A) mammary glands 8) relatively larger brains than other vertebrates 24, mammalan trait? C) a diaphragm D) a four-chambered heart E) live birth

Explanation / Answer

Ans 23. (A) Choanocyte

The group of organisms that comprise the phylum Porifera are known as the sponges.Sponges have specialized cells called choanocytes that help them survive.Choanocytes are cells located on the whip-like appendages, called flagella.The movement of water initiated by the choanocytes aids the digestive and respiratory systems of the sponge because as well as pulling in water, they also pull in oxygen. They then push out both carbon dioxide and waste materials.

Ans 24. These all characteristics are the mammalian trait. Mammals are amniotes and have following characteristics:

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