Hailey’s comet becomes visible after every_________?
A. 86 years
B. 76 years
C. 1000 years
D. 365 years
_________ planets orbits around the sun in a clockwise direction?
A. Earth
B. Mercury
C. Jupiter
D. Venus
There are _____ kinds of joints present in a human body?
Skin cancer known as Melanoma associated with ____________?
A. ozone accumulation
B. ozone depletion
C. acid rain
D. allergens
____________ is the outermost layer of skin.
A. endodermis
B. dermis
C. epidermis
D. hypodermis
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