Assalam o alaikum warahmatullah Zoo 507 . . timing 11:30 Subjective: 1 difference b/w spring and neap tides 2. Factors affecting the.composition of community and ecosystem . 3. Effests of air pollution. 4. Fauna of desert ecosystem 5. Sources of water pollution 6. Threats to snow leopard 7 Radioactive contamination . 8. How much abundance of ozone in stratosphere and troposphere . 9. Note on economic growth due to services and nation's goods. Objective from ppt's like %'s, who discover ecology , National animals and bird , and boht sy repeat hoy hn jo oopper discuss ho chuky hn.