Which of these is not an example of mechanical weathering?
a. waves crashing on a seashore
b. a glacier moving down a mountainside
c. a river flowing from a mountain into a valley
d. a cave forming when limestone rock is exposed to acid

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.