Actions involving windows would not save energy is, replacing windows with screens. Option a is correct.
Screens are designed to let air and light in while keeping insects out and do not provide any insulation against heat loss or gain. Therefore, replacing windows with screens would not save energy. On the other hand, caulking around windows, using an awning or roof overhang, and replacing old windows with new energy-efficient ones are all effective ways to save energy by reducing air leaks and improving insulation. Option a is correct.
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Imagine a very simple food chain with just 3 trophic levels, phytoplankton, zooplankton, and fish. The
fish require 10,000 calories to persist. There are 100,000 calories in the phytoplankton. Would there
be enough energy in this food chain for all of the fish to survive? What is this process called?
O Yes; Bottom-up control
O No; Top-down control
O Yes; Top-down control
O No; Bottom-up control
Answer: No; Bottom-up control
Explanation: law of 10 %
It has been pointed out that bottom-up control likely dominates at lower trophic levels (i.e. the plant compartment, and sometimes the herbivores), while the top-down controls are dominant at higher trophic levels.
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Read the passage from Darwin's journal.
The Amblyrhynchus, a remarkable genus of lizards, is confined to this archipelago; there are two species, resembling each other in general form, one being terrestrial and the other aquatic. This latter species (A. cristatus) was first characterized . . . from its short, broad head, and strong claws of equal length, that its habits of life would turn out very peculiar, and different from those of its nearest ally, the iguana. It is extremely common on all the islands throughout the group, and lives exclusively on the rocky sea beaches, being never found . . . even ten yards in-shore. It is a hideous-looking creature of a dirty black color, unintelligent and sluggish in its movements. The usual length of a full-grown one is about a yard, but there are some even four feet long; a large one weighed twenty pounds: on the island of Albemarle, they seem to grow to a greater size than elsewhere. Their tails are flattened sideways, and all four feet are partially webbed. They are occasionally seen some hundred yards from the shore, swimming about; and Captain Collnett, in his voyage says, “They go to sea in herds a-fishing, and sun themselves on the rocks, and may be called alligators in miniature.” It must not, however, be supposed that they live on fish. When in the water, this lizard swims with perfect ease and quickness, by a serpentine movement of its body and flattened tail—the legs being motionless and closely collapsed on its sides. A seaman on board sank one with a heavy weight attached to it, thinking thus to kill it directly, but when an hour afterward, he drew up the line, it was quite active. Their limbs and strong claws are admirably adapted for crawling over the rugged and fissured masses of lava, which are everywhere from the coast. In such situations, a group of six or seven of these hideous reptiles may oftentimes be seen on the black rocks, a few feet above the surf, basking in the sun with outstretched legs.
What structural adaptation of the A. cristatus lizard helps them in the water?
A} Large Size
B} Fishing In Herds
C} Flattened Tail
D} Strong Claws
Answer:
C. Flattened tail
