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*BIOLOGY-PRACTICALS*

2ai)
A Sex male
B Sex female
2aii)
A - Because is a sperm cell tum
Because D is an enoumerom 
2b)
The letter X between cliedram A and B
represent mating (crossbreeding)
2bi)
- testis
- Sperm Cell
- Union
- Zygote 
2cii)
i)Because it whene Sperm Cell Que formeel
ii) because it has head and tail on for movement
iii) Because the sperm colegg fuse together
iv) it is the product of the Union
2d)
The process is meiotic twisiors
=========================================
4a)
Vertical section of a human skin 
4b) 
i- hair shaft 
ii- sebaceous gland 
iii- erector muscle
iv- sweat gland 
vi- blood vessel 
vii- fatty cells 
viii- cold sense receptor 
ix- dermis 
x- epidermis
4b) 
i) excretion 
II) maintenance of a suitable constant body temperature 
iii) storage of reserved food 
iv) protection 
v) osmoregulation
4c) 
low - constricts 
high - contracts
4d)
VI) transfers oxygen and nutrients to the skin 
VIII) responsible for sensitivity of the skin to light
X) provide a water proof Barrie' and create our skin tone
4e)
i) hot day
-vasodilatation
-sweating and cooling
-skin relaxation
ii)Cold day
-vasoconstriction
-Erector muscle contract
-skin assume erect position with trapped in between
4f)
victim D
4g)
i)bathing with soap and water
ii)exposure to fresh air
iii)check up on disease break out 
iv)exposure to sunlight

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