Nervous systems are required by animals to respond to stimuli and have complex senses such as taste, touch, sight, smell, or sound. these are carried by nerves to and from the brain and spinal cord. of all major animal phyla, which does not have nerves?

Sample 1: 41 stomata per mm^2

Sample 2: 214 stomata per mm^2

Explanation:

The density of the stomata on a leaf is the number of stomata on a leaf per leaf area. It is measured per unit area i.e. per square mm (mm^2).

The unknown leaf was taken to the laboratory and a microscope with a field diameter of 0.5mm was used. Since the density is measured per unit area, we need to find the area of the field of view.

To find the area, we use πr^2, which π= 3.142 and r= radius (diameter/2 i.e. 0.5/2 = 0.25mm)

Hence, using Area = πr^2

= 3.142 × 0.25 × 0.25

= 0.196

Therefore, the area of the field of view is 0.196mm^2

The stomata count for the samples are:

Sample 1: 8 counts

Sample 2: 42 counts

Area of field of view on microscope= 0.196mm^2

Therefore, the stomatal density of each sample of leaf in a single count is calculated by saying;

Number of stomata × 1/area

Sample 1= 8 × 1/0.196

= 8 ÷ 0.196

= 40.82

Approximately, we have 41 stomata per square mm as the density for sample 1

For sample 2: 42 × 1/0.196

= 42 ÷ 0.196

= 214. 2857

Approximately, we have 214 stomata per square mm as the density for sample 2.