[Answered] How many elements are essential to life? A) 10 B) 30 C) 70 D) ...

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Author Question: How many elements are essential to life? A) 10 B) 30 C) 70 D) ... (Read 23 times)

RODY.ELKHALIL

Hero Member
Posts: 591

on: Aug 27, 2018

How many elements are essential to life?

A) 10
B) 30
C) 70
D) 110

Question 2

The efficiency of current solar cells is approximately

A) 3.
B) 15.
C) 25.
D) 75.

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Marked as best answer by a Subject Expert

bigcheese9

Sr. Member
Posts: 333

Reply #1 on: Aug 27, 2018

Answer to Question 1

B

Answer to Question 2

B

RODY.ELKHALIL

Member
Posts: 591

Reply 2 on: Aug 27, 2018

Excellent

flexer1n1

Member
Posts: 373

Reply 3 on: Yesterday

Great answer, keep it coming

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