A tropical storm becomes a hurricane when wind speeds reach 50 km/hr.

Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber? 1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3.

How is observant used by scientists

Why are sea otters well suited for life in the kelp forest?

What kingdom was divided to create the six-kingdom model of classification? a. Animalia c. Plantae b. Prokaryotae d. Fungi

Organisms that live in exceptionally harsh conditions such as hydrothermal vents, similar to what was found in early Earth's primitive conditions, are classified in what domain? A. Archaea B. Bacteria C. Eukarya D. Prokary

Glutamic acid (Glu) and valine (Val) are two amino acids with different molecular structures. (Glutamic acid is a strongly hydrophilic molecule, and valine is a strongly hydrophobic molecule).

Name the earth's five major environmental spheres and state the defining characteristics of each

Specific substances that cut even the largest dna molecule into fragments are called

Nree examples of mass transit options in livable cities.

Which is an example of condominance