What characteristic do tantalum and tin have in common?
1.used infrequently in modern manufacturing
2.beneficial for human health
3.mined in the united states and canada
4.categorized as conflict minerals

4. categorized as conflict minerals

Explanation:

Conflict materals are mined in conflict places and the funds that a derived from trading the mineral is used to fund wars or fighting.

Option 4, categorized as conflict minerals

Explanation:

The four minerals primarily  

a)Coltan – Titanium is extracted from this

b)Cassiterite -  tin is extracted from this

c)Gold  

d)Wolframite – tungsten is derived from this

And their derivatives are considered as conflict minerals. These are collectively known as T3G minerals.  

A regulation has been defined to report conflict minerals compliance in which the information about the entire supply chain along with essential information such as country from which the mineral originated, smelters and refineries being utilizes etc. to cater the conflict between the Congo Republic and its adjoining countries.  

Hence, option 4 is correct

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.