Question

Cos a + cos (a +120 degree) +cos(a-120 degree) = 0

Answer 1

Answer:

Pteridophytes have naked embryo and inconspicuous reproductive organ whereas — phanerogams have well-differentiated reproductive organs and covered embryo.

Answer 2

Answer:

Fauna: The animal species found here are camels, hyenas, jackals, foxes, scorpions and many varieties of snakes and lizards.Flora: Vegetation in the Sahara desert includes cactus, date palms and acacia.Flora: Vegetation in the Sahara desert includes cactus, date palms and acacia.