Earth experiences both long-term and short-term climate cycles. The tilt of Earth's and the change in its shape lead to long cold periods known as and warmer periods known as.

Which two protists have eyespots

Many people with human immunodeficiency virus (HIV) wear a mask to cover their noses and mouths. Which statement best explains the importance of the mask? It prevents HIV patients from catching airborne diseases.

The flap of cartilage that covers the opening of the larynx is the

What does a plant need for photosynthesis?

Which animals are vertebrates? Check all that apply. jellyfish lizards horses grasshoppers birds

Which of these modes of transmission require a bodily opening either natural or artificial?

Which factor is a characteristic of an acid? A. Non-corrosive B. Soapy C. Sour D. Slippery

How are unique daughter cells created in meiosis? A. Homologous pairing B. Crossing over C. Mutation during reduction Division D. Zygote fertilization

In any food web, which organism has the LEAST available energy? A) birds or omnivores B) plants or producers C) fungi or decomposers D) animals or carnivores

What organelle stores DNA in eurkaryotic cells?