What did the presence of photosynthetic prokaryotes allow

a. more oxygen to enter the atmosphere
b. more water to enter the atmosphere
c. more sunlight to enter the atmosphere
d. more hydrogen to enter the atmosphere

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?