Explanation

Bees are by far the most effective pollinators because they feed only on flowers.

Flowers attract and reward bees for their pollination service.

Explanation

Vitamin B12 is naturally present in foods of animal origin, including fish, meat, poultry, eggs, and dairy products.

Explanation

The eye is made up of three coats, which enclose the optically clear aqueous humour, lens, and vitreous body. The outermost coat consists of the cornea and the sclera; the middle coat contains the main blood supply to the eye and consists, from the back forward, of the choroid, the ciliary body, and the iris.

Explanation

A fluorescent lamp consists of a glass tube filled with a mixture of argon and mercury vapour.

Explanation

The ozone layer protects the Earth against most UVB coming from the sun.

Explanation

 The kidneys are two bean-shaped organs responsible for filtering the blood and removing waste.

Explanation

Pluto is currently the most distant planet from the Sun, though as you probably know Pluto was “demoted” to dwarf planet status in August 2006.

Explanation

Similarly, you could input the percentages normally and then divide by $100$:

${\text{M}}_r\left(\text{Ga}\right)=\frac{(68.9256\cdot 60.108)+(70.9247\cdot 39.892)}{100}$

${\text{M}}_r\left(\text{Ga}\right)=69.7231\text{to 4 decimal places}$

Explanation

Rust is iron oxide, which forms when iron or an alloy that contains iron is exposed to oxygen and moisture for a long time

Explanation

Seasonal contrasts are maximum in mid latitude.