How can you explain that human teeth,lips,larynx and pharynx make humans distinct from other creatures?

after the Kellogg and the Hayes unsuccessful trials to train Gua and Viki to speak , the
Gardener used another techniqe with Washoe.Explain

السوال الرابع 5درجات
Identify the voicing ,place,and manner of articulation of the following sounds
1-l g l
2- l s l
3- l f l
4-l h l
5- l 3 l
السوال الخامس وعليه 4 درجات

Choose the right statement of the following :
1- Aproperty of language that allows users to talk about things and events happend in different times and places is known as,
1- productivity
2- displacment
3-duality
4- arbitrariness

2- Glids are
1- L r l,l L l
2- l w l,l j l, l h l
3- l h l, l ؟ l

3- Fricatives are
1- l t f l , l d3 l
2- l f l,l v l,l s l,l zl
3- l p l,l b l,l d l,lt l,l k l, l g l
4- the low front vowel is
1- l a l
2- lae l
3-l i l
4- الي على شكل حذوة حصان يابنات