Answer: the resource which they are not likely to compete for is CARBONDIOXIDE. The correct option is C.
Explanation:
Competition may be defined as the a negative effect on plant growth which occurs when there is reduction in the availability of resources.
During the growth of plants, there are several resources that affects it's growth and maintenance. These resources include:
--> soil nutrients,
--> water,
--> carbondioxide and
--> sunlight
Since plants are autotrophs, that is, they manufacture their own food through the use of inorganic raw materials such as water and carbondioxide in the presence of sunlight, there may exist some level of competition for these resources when there is lack of space.
But plants are NOT likely to compete for carbondioxide because the atmospheric pool of carbondioxide is large and well mixed, therefore it won't be affected by lack of space between the two plants. Unlike the other main resources such as soil nutrients and water which are highly competed for and can determine the distribution of plants in an ecosystem.
Answer: (a) cesium and bromine :
(b) sulfur and barium: 
(c) calcium and fluorine :
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
(a) cesium and bromine: Here cesium is having an oxidation state of +1 called as 
cation and bromine 
is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral 
called as cesium bromide.
(b) sulfur and barium : Here barium is having an oxidation state of +2 called as 
cation and sulphur 
is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral . called as barium sulfide.
(c) calcium and fluorine: Here calcium is having an oxidation state of +2 called as 
cation and fluorine 
is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral . called as calcium fluoride.
Answer:
The remora benefits by gaining a measure of protection, and it feeds off of the remains of the meals of the larger fish.
Explanation:
They are both benefited
Dependent could be the amount of water, the time that you are using in the u tube. Independent could be the amount of hydrogen and oxygen gass.
Remember, dependent variable is something that you control or measurement. Like for example. You have 2 different tubes one with 5ml of water and the other one with 10ml.
Independent something you cannot control. Like the amount of light can a plant receive or how much long it will take water to boil depending on the how high the fire is
