What characteristics have made arthropods the most successful phylum? How do these animals grow?
Can you think of any disadvantage of growing this way? What will be an ideal response?
ANS:Answer
should include:
? Arthropods are segmented, but not in the same way as annelids. They have clear
segments have a pair of appendages attached. These appendages have articulation that
was a successful evolutionary adaptation for arthropods. They are able to move and bend
at specific joints on the animal. Each joint allows a full range of motion.
? Arthropods have an exoskeleton. This is a strong, lightweight outer covering made of
chitin. An exoskeleton is form-fitting and moves with the animals.
? Arthropods developed lightweight striated muscles. This makes rapid movement
possible.
? An arthropod grows by molting. The exoskeleton is shed at regular intervals. Once it is
shed, the arthropod expands its tissues with water and grows a new shell.
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Why does acid rain result from fossil fuel consumption?
A) Fossil fuels heat the atmosphere, making rain more acidic. B) Fossil fuel burning releases nitrogen and sulfur oxides. C) Particulates emitted from fossil fuel burning settle in lakes and acidifies them. D) Fossil fuel burning releases stored organic carbon.
Make a P–T-t diagram based on this information from the eclogite province of the Bergen Arcs (for references, see Bingen et al, 2004): (1) Granulite facies: almost 1 GPa and 800–850 °C at ~930 Ma (U–Pb ages of zircon). (2) Eclogite facies: 1.8–2.1 GPa and ~700 °C at 423 ± 4 Ma (U-Pb zircon rim crystallization age). (3) Amphibolite facies retrogressive shearing: 0.8–1.2 GPa and ~690 °C at 409 ± 8 Ma (Rb/Sr). Other ages: Dikes predating amphibolite facies shearing: 422 ± 6 Ma to 428 ± 6 Ma (Rb/Sr) and 418 ± 9 (U-Pb). Apatite fission-track ages around 180 Ma indicate time of cooling through 150 °C. to
What will be an ideal response?
For a forecast to show ____, it should be better than one based solely on the current weather or the "normal" weather for a given region
A) skill B) accuracy C) chaos D) persistence
________ refers to the agricultural practices in which the members of a farming family produce only enough food for themselves and do not make use of large-scale irrigation, chemical fertilizer, or machinery and technology
A) Subsistence agriculture B) Reduced tillage agriculture C) Advanced organic farming D) Subsidence agriculture E) Intensive traditional agriculture