Thick fur can be used for keeping warm, and sheep are mammals with thick, woolly fur, and hoofed feet. Given these facts, sheep have what fur to keep warm among the following options: - cropped - wooly - fats - white - straight - hair - warmth - warm
wooly

Having no natural predators increases population size, and any population has the potential to produce more offspring than the environment can support. Given these facts, having what increases the potential to produce more offspring than the environment can support among the following options: - no natural habitat - no natural prey - competing for resources - peachleaf willow - no natural owners - members of their own species - animals with backbones - no natural predators
no natural predators

Q: Mechanical weathering is when rocks are broken down by mechanical means, and water is a mechanical weathering force. Given these facts, what are broken down by water among the following options: - rocks - germs - shells - lipids - soils - sand - dead - fungi
A: rocks

Question: If a thermal conductor is exposed to a source of heat then that conductor may become hot, and copper is a great thermal conductor. Given these facts, what becomes hot when exposed to a source of heat among the following options: - rubber - wool - an object - copper - paper - sugar - the skin - our star
Answer: copper

*Question*
Many corals secrete an exoskeleton that builds up to become a coral reef, and an exoskeleton is an external framework. Given these facts, what do many corals secrete that build up to become a coral reef among the following options: - an external framework - The area was once underwater - that material's properties - bioaerosols - water - dust - after too much water received - oxygen
**Answer**
an external framework

*Question*
Uneven heating of the Earth 's surface cause wind, and geothermal heat is warm heat. Given these facts, what does uneven warming of the Earth's surfaces cause among the following options: - Winter - harm - wind - sweat - Injury - SNPs - force - warmth
**Answer**
wind