A fast-flowing river of air that forms when two air masses of very different temperatures meet is called a A) el Niño. B) jet stream. C) trade wind. D) sea breeze.

Some monkeys in a population have a gene that causes stiff joints after the age of reproduction over time arthritis within the monkey population will

Which bone is not considered to be part of the cranium? sphenoid bone ethmoid bone lacrimal bone occipital bone?

Which of these is an important characteristic of a scientific theory? A. It has to do with gravity. B. It is frequently adjusted. C. Many scientists believe it is correct. D. Many people who aren't scientists believe it is correct.

Cladodes are modified stems. which is their main function? A. Water retention B. Food storage C. Photosynthesis

Multicellular organisms first appeared during the Mesozoic Era. True or False?

How long does gunpowder residue remain on a shooter's hands? A few hours About 24 hours A few days About a week

Why are some planets made of frozen gases and others solid?

The skin is the primary organ of the

What is true for urochordates? A. The notochord is present throughout their lives. B. The notochord is present only in the larval stage; it is absent in adults. C. The notochord is present in the larval stage; it becomes vertebrae in adults.

What term is used to refer to a characteristic of a population in statistics?