A student is doing resistance exercises. After one week, she can lift a weight of 2kg. After four weeks, she can lift a weight of 3kg. By what percentage has the weight that she can lift increased?

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

can you make it bigger i can't see it