16. A chalk box is 5/6 th full of its capacity. 5 chalks were taken out by a teacher and 2 chalks were put inside it by a student. If it is 4/5th full now, how many chalks the box
contained when it was full?
(a) 90
(b) 80
(c) 72
(d) can't be determined

Registrars maintain high a. standardized tests b. faculty payrolls c. transcripts d. sporting facilities

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.

Which statements are true for invasive species? 1. they always stabilize an ecosystem. 2. they’re always successful in adjusting to a new habitat. 3. they often compete with the native species for resources. 4. they have the ability to displace the native species. 5. they’re always pests.