Which characteristic is shared by all arthropods. a. jointed legs b. endoskelent c. gills or d. calcified hard shell

The correct answer is A. Jointed legs

Explanation:

Arthropods are a type of animal mainly characterized by an exoskeleton or external skeleton and jointed appendages or legs, which means all arthropods have legs or similar structures that are divided into different sections known as podomeres. In the same way, the body of arthropods is composed of different segments. This category includes animals such as spiders, scorpions, bees, crabs, among others. Additionally, some but not all arthropods have other features such as shell or wings. According to this, the characteristic that is shared by all arthropods is jointed legs (option A).

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

answerspecific gravity;