the correct answer is the first one. density = mass / volume.
i hope this helped!
Answer: A) Two atoms share electrons so they can fill their outer shells
Explanation: A covalent bond is a type of bond formed by sharing equal number of electrons between two non-metal atoms so that both of them can attain a stable octet or duplet structure of noble gases.
In covalent bonding, there is no loss or gain of electrons between atoms. For example, the formation of chlorine molecule, chlorine atom has seven electrons in its outermost shell, remaining one electron to attain an octet structure of noble gases. Two chlorine atoms share one pair of electron, each chlorine atom donating one electron to form a pair so that each atom in the chlorine molecule attains an octet structure..
the same goes for the other
Natural selection is a process of adaptation by an organism to the changing environment by bringing selective changes to its genotype or genetic composition.
Artificial selection, also called selective breeding, is the process where humans identify desirable traits in animals and plants and use these traits to develop desirable phenotypic traits by breeding.
Some examples of natural selection include the selection of long-necked giraffes and the changes in the size and shape of beaks of birds according to their feeding habits.
Some examples of artificial selection include dog breeding to produce new breeds of dogs and cross-breeding in cash crops like wheat and rice.
Answer:
By experimenting and comparing the results on different body parts.
Explanation:
The "Two Point Discrimination Test" is designed to illustrate the density of touch sensitive receptors for different parts on our body and our ability to tell if there are two distinct objects that we are touching or not.
The density of touch receptors in different receptive fields on our body can be our hands and our back for example, the receptive field density is much more higher in our hands for evolutionary reasons so we are able to more easily tell two distinct objects apart that we are touching with our hands.
I hope this answer helps.
