Q: The part of the ecosystem required by a particular species is endangered when human activity threatens loss of what? Choices: - primary producers - primary speciation - biodiversity - habitat A:
habitat

Q: Displacement, velocity, acceleration, and force are examples of what type of quantity that has magnitude and direction? Choices: - cycles - wave - frequency - vector A:
vector

Q: Q: The nature of what gives metals the properties of being ductile and malleable? Choices: - liquid bonds - magneticism - titanium bonds - metallic bonds A:
A: metallic bonds

Question: Q: What is the name for the tiny air sacs at the end of bronchioles? Choices: - gills - vacuoles - ganglion - alveoli A:
Answer: alveoli

*Question*
Q: A circuit that consists of two loops is called a what? Choices: - diverse circuit - unnatural circuit - complex circuit - parallel circuit A:
**Answer**
parallel circuit

(Q).
Q: What do we call animals that have a backbone and belong to the phylum chordata? Choices: - organelles - mammals - invertebrates - vertebrates A:
(A).
vertebrates