Q: What type of cells are the smallest of all human cells? Choices: - egg - dna - meristematic - sperm A:
sperm

Q: The presence of what stratospheric gas layer decreases the frequency of skin cancer and other damaging effects of ultraviolet radiation? Choices: - plasma - cumulonimbus - smog - ozone A:
ozone

Q: Q: What type of species can alternate between medusa and polyp forms? Choices: - mollusks - crocodilian - chordata - cnidarian A:
A: cnidarian

Question: Q: What do organisms need to speed up biochemical reactions? Choices: - genes - carbohydrates - hormones - enzymes A:
Answer: enzymes

*Question*
Q: Footprints, burrows, and waste are considered what type of fossils? Choices: - movement fossils - crater fossils - morphology fossils - trace fossils A:
**Answer**
trace fossils

Q: Q: What type of energy travels through matter in wave form? Choices: - vibrational - magnetic - light - sound A:
A: sound