You have been tasked to estimate the number of rattlesnakes in the desert by Lone Mountain. You capture 42 rattlesnakes and tag them on the first day. You return to the
site one week later and capture 59 rattlesnakes. Of the 59 you caught, 21 are marked
from the first sample. How many rattlesnakes are in the population?

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

i think its both a and b

energy per photon is e = h*c / λ  

e = 6.63*10^-34 * 3*10^8 / 6*10^-7 j = 3.315*10^-19 j  

nr. of photons = 10j / 3.315*10 = ^-19 j per photon = 3.02*10^19 photons