In an investigation, individual Rhabdostyla were placed into different concentrations of sea water. The rate of water excreted by the contractile vacuðle of each organism was determined. The results
are shown in Fig. 4.2.
20
18-
16
[3]
14
12
rate of
water
excreted
um's
10
8-
6
4-
2
0
0
4
12
Explain the result

Invasive species are one of the major threats to biodiversity. these species multiply quickly and compete with native species for food, sunlight, spac and other resources. on the map, determine the area where native species will have limited resources available to them due to invasion threat from invasive species threat very low low medium high very high

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f