A student wants to estimate the number of daisy plants in a 500 mfield. She uses a 1 m² quadrat to sample the field.
Figure 9 shows the results for the number of daisy plants counted in six areas
sampled with the quadrat
sample
number
number of
daisy plants
mean diameter of
daisy plants/cm
1
5
7
2
2
2
3
6
9
4
3
3
5
4
5
6
4
6
Figure 9
Calculate the mean number of daisy plants for the six samples.
(1)

The image below shows a weather service map. which details best describe this map? check all that apply

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos