Luminosity is the total energy that star produce in one second, depending on both the radius of the star and on its surface temperature. Thus, all the star's properties such as its temperature, size, brightness and life span is determined by its luminosity.
The metabolic waste found in fetuses is excreted through the umbilical cord back to the mother. Some of it goes to the <span>amniotic fluid which can be seen when the baby is born.</span>
Explanation:
As I think your question is incomplete .So sorry I am unable to give the answer.Plse rectify the question.
Answer:
B
Explanation:
blood only absorbs end products of digested food .
An reaction that releases energy into the environment.
The enthalpy change (energy taken in for bond breaking of reactants - energy released for bond forming of products) can be used to determine whether a reaction is exothermic or endothermic. Since an exothermic reaction has a negative enthalpy change, it means it releases more energy than what it takes in. Hence the third statement is correct.