Question:
Many cells have a nucleus that contains chromosomes. These chromosomes carry genes that are composed of
OPTIONS:
- hormones
- DNA molecules
- minerals and water
- undigested food molecules
Answer:
DNA molecules
Question:
Dust and ash entering the atmosphere as a result of volcanic eruptions can affect Earth's
OPTIONS:
- tidal activity
- orbital shape
- weather and climate
- rotation and revolution
Answer:
weather and climate
Question:
The population of which of the following 26 organisms would most likely decline if small animals like rats, rabbits, and snakes were eliminated from an ecosystem?
OPTIONS:
- earthworms
- grasses
- hawks
- mushrooms
Answer:
hawks
Question:
Which statement describes a method of sexual reproduction that occurs in plants?
OPTIONS:
- Stem cuttings are placed in water and grow roots.
- Seeds are produced from the flower of the plant.
- Underground stems from a plant grow into new plants.
- A leaf falls to the soil, develops roots, and grows.
Answer:
Seeds are produced from the flower of the plant.