A Volcano

A River

Carrot!

Light (or any other electro-magnetic wave form)

a joke!

Meat!

None. The animals, irrespective of the count, are with the zookeeper (.. . a zookeeper had 100 pairs of animals,,,) whereas the question asked “how many animals do you have left…” I’m not the zookeeper, hence I have none of the animals. 🙂

If the question is about the animals left with the zookeeper, then the answer would be 577.

Initial Stage: 100 pairs of animals = 200 Nos. of animals.
Stage 2: Two pairs of babies (i.e., 4 babies) are born to each of them. That would be 400 baby animals. (When a pair of animals get one baby, each of the pair has a baby.)
Stage 3: Out of the total 600 animals (original 200 plus 400 babies), 23 animals (not pairs) don’t survive,. Hence, we are left with 600 – 23 = 577 animals.

Time (on a 12-hr basis)
9 (AM) + 5 (hrs) = 14 => 2 PM

E

Matchstick