<u>Answer</u>:
The null hypothesis: the mean egg thickness is 0.2 mm 
The alternative hypothesis: the mean egg thickness is less than 0.2 mm 
In statistics, the null hypothesis states that there is no significant difference between the observed value and the mean thickness. The alternative hypothesis states is the opposite and states the scientist's "idea" behind the experiment. Here, it refers to the fact that due to DDT, the egg shell will be thinner compared to the mean value.
The two sources of heat in the earth's interior are-
A. The leftover heat from formation and radioactive decay
Explanation:
The leftover heat from the time when the planet was formed, which has not yet been lost, is a source of internal heating of the earth. There are various radioactive elements present deep inside the earth and they are decaying slowly and gradually and emit heat into the earth's interior.
The answer is D. This means that is you have a determined amount of force (in newtons) being applied on an object of known mass (in kilograms), then to determine the acceleration of the object, divide the force by the mass (or multiplying the force with the inverse of the mass of the object). This behavior of objects is stipulated in Newtons/ second law. Increasing the force increases the acceleration while increasing the mass decreases the acceleration of the object. Acceleration is a vector quantity meaning it has magnitude and direction.
Three of the major characteristics used to classify organisms are cell structure, mode of nutrition and cellularity. These characteristics help scientists determine how organisms are similar to each other as well as how they are different from each other.
Paliozoic era- sea life
Mezazoic era- dinorours
Centozoic era- current time
