Guard cells. They open and close to allow for gas exchange within the leaf
<span>A
gradual change in phenotype over a geographical area is called a cline (or clinal variation).</span>
A
cline is gradual phenotypic (and/or genetic) differences over a geographical
area. It usually happens as a result of the change of allele frequencies within
the gene pool.
Answer:
Another 2014 study found that salamanders, thanks to their taste for leaf-chewing insects on forest floors, can even help fight climate change.Because of amphibians' appetites for mosquitoes, they're able to help reduce the spread of mosquito-borne illnesses such as malaria.
Answer:
Open circulatory systems are advantageous to some animals because they use less metabolic energy.
Explanation:
Open circulatory systems are also known as lagoon circulatory systems. In this systems the blood is not necessarily always inside the blood vessels; It leaves the heart and will directly irrigate the organs and then return by other means or mechanisms.
So that it can be understood more easily, it is necessary to think about this system acting in organisms much smaller and less complex than mammals or any other vertebrate of greater size. As this animals doesn't have a great size, they need to use less metabolic energy than more developed organisms, so this system allows them to save metabolic energy to be used in other living functions.
