4ai) Vertical section of a human skin 

aii) 
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

2ai)
A - Male
B - female

(2aii)
A - Because E is a sperm cell from A
B - Because D is an egg(ovum) from B

(2b)
The letter X between diagram A and B
represent mating (cross breeding)

(2ci)
I - Testis
II - Sperm Cell
III - Union
IV - Zygote 

(2ci)
I - Because it where sperm Cell are formed
II - Because it has head and tail region for movement
III - Because the sperm and egg fuse together
IV - It is the product of the union

(2d)
The process is meiotic division










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2018 Waec Gce   Biology Practical  Questions and Answers is available , Biology Practical   2018 Waec Gce Exam Expo, all you need to do is to follow the instructions above, get verified Biology  Practical Questions and Answers here, question and answers are now Available. expo for WAEC Gce 2018 Biology  , exam runs for Biology Practical  questions and answers. 

Also Read>>   2018 Neco Biology Practical Questions and Answers | Biology Practical Expo

2018 Waec Gce   Biology Practical  Questions and Answers is available , Biology Practical   2018 Waec Gce Exam Expo, all you need to do is to follow the instructions above, get verified Biology  Practical Questions and Answers here, question and answers are now Available. expo for WAEC Gce 2018 Biology  , exam runs for Biology Practical  questions and answers. 
Also Read>>  2018 Neco Biology Objective and Essay Questions and Answers | Biology Expo

2018 Waec Gce   Biology Practical  Questions and Answers is available , Biology Practical   2018 Waec Gce Exam Expo, all you need to do is to follow the instructions above, get verified Biology  Practical Questions and Answers here, question and answers are now Available. expo for WAEC Gce 2018 Biology  , exam runs for Biology Practical  questions and answers.