Which of the following does the arthropod class arachnida not include?
ticks
scorpions
spiders
none of the above

none of the above

Explanation:

Arachnida is the class of joint legged invertebrate animals. Almost all the organisms in this class exhibit eight legs. The front pair of the legs have a sensory function. Spiders are the largest order of animals in this class. This order includes organisms such as scorpions, mites, ticks, solifuges and harvestmen.

On the basis of the above explanation, among the given option, none of the above is the correct one.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.