What are the main ways in which animals communicate with one another?

What data is collected on seafloor spreading and the southern Atlantic Ocean? A. The abundance of sea life B. The age of basalt in the ocean crust C. Type of coral reefs D. Type of fossils on the seafloor

What is the main difference between a tundra and grassland?

A is a type of mass movement that occurs when a thin block of soil, rock, and debris seperates from the underlying bedrock A. eruption B. flow C. landslide D. creep

Why does Earth have a liquid water supply and the moon does not? A. The moon does not have a magnetic field B. Earth is much colder than the moon C. Earth was bombarded with comets D. The moon does not have strong enough gravity

What are forces that combine and form a net force that is not zero

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?

Which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll?

Why do farmers sometimes use more wasteful methods of irrigation than are available?