Noah's Ark

The ark was approx. 510 feet long, 72 feet tall, and 43 ft wide, at the most generous definition of a cubit.

The global flood lasted for a year

Answers in Genesis states that there were 7000 animals on the Ark, or 3500 species

Looking at just horses; assuming a standard size square bale of hay, at 14 inches high by 18 inches wide and 35 inches long, the food for those two horses for an entire year would be a stack of haybales 64 feet long, 33 feet wide, and 25 feet high.

Noah's Ark has approx. 1,578,960 cubic feet of space toatl. The food supply for the horses would take 52,800 cubic feet of space. This leaves 1,293,612 cubic feet remaining. This is a 0.05 loss of space, leaving 95.95 percent of the space remaining. We then have to do this with the other 6998 animals that were on the Ark, including many that are much larger and eat much more than the horses.

7000 animals on the Ark divided by the 8 people on the Ark, is 875 animals per person. There are 86,400 seconds per day. Divide this by 875 animals, and each person would only have 98 seconds to spend per animal per day for feeding, cleaning of the stalls, etc. This assumes the 8 people never stop to eat, or sleep for an entire year. Presumably through the power of God.

Noah's Ark landed at Mount Ararat. Kangaroos must have been on the Ark. There are about 10,000km between Mt. Ararat and Australia, in a straight line. These warm weather animals crossed huge amount of geography, including the cold Himalaya mountains, then swam the through an ocean to get to Australia. Presumably God made them.

Sloths are even worse. It is about 11,000km from Mt. Ararat to South America. Sloths have a top speed of 1.9km per hour, so it would take 5789 hours to make that journey. That is 241 days straight journey. They would also need to swim through an ocean. Sloths are strong swimmers, but the Atlantic Ocean is very big. They would need to swim for a very long time without stopping on dry land to eat or sleep. Sloths also do not like to move.

What happened to the plants? Apparently all the plants survived under the world wide flood for a year. Where did the olive leaf from the olive tree come from? How did the trees like Palm trees that are killed by salt water survive. Again, through the power of God presumably. At this point, seems like there was an easier way for an all power diety to kill everyone on earth except for 8 people. We aren't done yet.

What about all the cultures that survived the global flood? Egypt's 6th dynasty went right on without any intteruption. Several Chinese neolithic cultures went on without issue. A number of civilizations that should have been wiped out survived. They also never even noticed the water. How dare they.

There are an estimated 7.7 million species of animal on the planet. With about 25% are marine animals. So that leaves 5,775,000 of land animal. Subtract the 3500 that Noah started with, and we have 5,771,500 species that need to evolve in 4000 years. We need to see 4 new species a day in order for us the reach the levels of biodiversity we see today. This also needs to include the Dinosuars that were supposedly on the Ark, spread out over the entire earth, and then went extinct.