These traits are the expression of genes that are copied and passed on to offspring during reproduction. ... New traits can also come from transfer of genes between populations, as in migration, or between species, in horizontal gene transfer.
I think it’s a or b but Im confused with the question
Answer: 14.14 billion years (which is close to the age of the universe)
Explanation:half life (t1/2) U-235 = 703.8*10^6
original amountN0 at time t Nt = NO/4
t= (t1/2)*(ln(Nt/N0)/-ln2
= (703.8*10^6)*(ln0.25)/-ln2
= (703.8*10^6)*(-1.386)/-0.69
= 14.14*10^9 years
Answer:
Almost 20 years later, the number of zebra mussels has declined overall. And parts of the ecosystem, such as the number of zooplankton, native mussels, and clams, have started to increase.