What is the difference between invertebrate and vertebrate chordates? What organism has characteristics of both?
· Chordates, in general, are characterized as having a notochord, a tubular dorsal nervous system, and gill slits at some point in their development.
· Invertebrate chordates are organisms that have lost their notochord as they developed.
· Vertebrate chordates have the unique characteristic of the stiffening backbone. They also have internal skeletons made of calcified bone or cartilage. Skeletons gave protection to organs, a foundation for muscles, and uninterrupted support during growth.
· Amphioxus is the transitional species from invertebrate to vertebrate. It swims by undulating its body much like a fish while combing the water for food. Its well developed dorsal nerve chord is similar to a vertebrate's spinal cord.
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During which months are the Philippines most susceptible to typhoons?
A) August-October B) November-January C) January-March D) April-June E) June-August
In association with other natural factors, the Milankovitch cycles explain the advance and retreat of glaciers according to which of the following time periods?
A. hundreds of millions of years B. several million years C. ten thousand years to one hundred thousand years D. hundreds of thousands of years
Which is not a factor that determines if bond strength will increase?
A) close distance of atoms B) larger nuclei in atoms C) greater charge of particles D) larger size of molecules
What is the term for a pattern of wind circulation that changes with season?
A) Land breeze B) Monsoon C) Doldrums D) Atmospheric cell