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What is the purpose of a swim bladder in fish?

A country with zero human population growth is likely to be ________.

The hypothalamus detects fluctuations in temperature. The receptors on it are known as thermoreceptors. Skin also possesses thermoreceptors which can detect the temperature of the external environment. This information is relayed to the hypothalamus which can in turn transmit nerve pulses for corrective mechanisms to occur. If you are HOT, sweating and vasodilation occurs. If you are COLD, vasoconstriction and shivering occur. In extreme cold, blood flow to extremities decreases in order to protect internal organs. This is an example of:

turtles in ponds.png Which pond has a higher species richness?

The Gulf of Mexico “dead zone” is caused by:

________use chemicals from the environment (like deep-sea vents) to make their food.

On the epidermis of a leaf are small holes that allow CO2 in and O2 out called:

Hox genes determine:

Which of the following threaten(s) biodiversity?

How many years are represented by one ring on a tree?