ASSIGNMER (b) Fig. 7.2 shows the total cross-sectional area of the blood vessels in the systemie
circulation. It also shows the changes that occur in blood pressure and the speed
(velocity) of blood in the different blood vessels.
6.
vena cava
Bora
issue huid
SS
29
3
4000
total Cross-
3000
sectionarea
of the blood
vessels./ama 2000
1000
0
pressure
mean blood
Pressure / Pa
speed of the
blood /cm 5-1
50
-40
valocity
16112109876543210
30
-20
10
0
aorta
arteriales
arteries capillaries
veins
vena cava
Fig. 7.2
(i) State the maximum mean blood pressure in the aorta.
13 kPa
[1]
(ii) Describe how mean blood pressure and speed of blood change with cross-
sectional area of blood vessels, as shown in Fig. 7.2.
blood pressure
NSSCO BIOLOGY - ASSIGNMENT 1 - 2021
24​

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

b. to discover aspects of the natural world.

hopefully i .