If warm-blooded animals can stay active in cold by shivering, then which can help warm-blooded animals stay active in cold? Answer choices: - shivering - four limbs - Animal fur - sleep - sweating - hibernation - cold blood - fur seals
shivering

If squirrels have a positive effect on the ecosystem, then what kind of effect does a squirrel have on the ecosystem? Answer choices: - Negative - Positive - adding heat - growth - food - Destructive - Powerful - support
Positive

Q: If adrenaline is a response to threats, then what is adrenaline a response to? Answer choices: - earthquakes - water - magnetism - threats - Heart rate - hormones - threatened - heat
A: threats

Question: If pollination is the fertilization step in the sexual reproduction of something that performs photosynthesis, then an organism that uses pollination as the fertilization step in sexual reproduction also performs wha? Answer choices: - competition - rapid expansion - in the autumn season - peachleaf willow - Chemical energy - important habitats - heat energy - Photosynthesis
Answer: Photosynthesis

*Question*
If arteries are needed to maintain energy levels, then _are needed to maintain energy levels? Answer choices: - Ligaments - follicles - hydration - environment - glucose - pores - exercise - Arteries
**Answer**
Arteries

If antibodies are large, Y-shaped proteins that recognize and bind to immunogens, then antibodies are large, Y-shaped proteins that recognize and bind to? Answer choices: - humans - positive - immunogens - animals - A Greek letter - protect them - Allergies - the skin
immunogens