The cоrrect chemicаl nаme fоr Cu2O is _______ _______
Pаssаge 2Reаd the passage then answer the questiоns that fоllоw.DIRECTIONS: Choose the best answer for each question.Crazy Mating Rituals For Birds[A] Birds have some of the most complex mating rituals of any animal. There's a reason for that: Males of most species have to work hard to impress the females, whether it's with killer dance moves or beautiful feathers, males go the extra mile to look good for females. The elaborateness of the courtship ritual is a result of the stiff competition. The female then takes her pick, thus ensuring the features that attracted her are passed on.[B] The specific mating rituals are passed on from generation to generation, but practice makes perfect. "There's certainly cases where the behavior can be done without having seen it or having been coached," says John Rowden, director of community conservation at the National Audubon Society.1 "By interacting with females they get better at it based on feedback." These feathered attempts to find a mate are sure to capture your attention.Red-Capped Manakin[C] There are more than 50 species of manakins, each known for its complex mating dances. But the red-capped manakin, native to Central and South America, has some particularly impressive moves. In mating season, the males gather in a small group to show off. Each bird selects a branch free of leaves that'll provide good visibility and function as a stage for the season. To the human eye, the dance itself is almost absurd, as the highlight is a dance move like a moonwalk.2 The little birds also add their own sound effects.Western Grebe[D] Grebes are well known for their enthusiastic mating displays. But that a western grebe succeeds in attracting a mate is nothing short of a miracle. Both the male and female must "walk" on water. How do they do it? Grebes are the largest creatures that walk on water, and until a few years ago, no one had looked into it. By slapping their feet at a speed of 14-20 steps per second (humans only manage about five steps per second) the grebe generates enough force to rise up out of the water. In groups of two or more, the grebes then run together, covering up to 66 feet in just a few seconds.Bowerbird[E] Bowerbirds don't have large and colorful feathers. Instead, the male constructs a structure entirely for the pleasure of the female. Once it's built, the male becomes an interior decorator, using anything from shells to dead insects to leaves to decorate it. Some even use certain colors, going as far as painting their structures prominently with berries. The competition is far from clean and males often fight, destroying each other's structures and stealing decorations. But when everything is arranged just so, the male sings and, if a female comes, they'll dance and mate. That's the extent of the romance, though. Once they've finished, the female leaves and the male begins attempts to attract another mate.Wahnes's Parotia[F] Sporting a host of striking colors, birds of paradise are some of the world's most dramatically beautiful birds - an asset when it comes to finding a mate, but which long made them the target of hunters. Males often sport enormous feathers or breast shields that feature in their mating rituals. But the Wahnes's parotia doesn't bank on looks alone. He first selects a bit of ground where a female can watch from above, and then clears the floor of leaves to create a large stage. Then, he bows like a gentleman and commences his dance. Shaking his head, he shows off his feathers. To a female in the branches he's a black oval, his iridescent3 breast plate all the brighter and the area on the back of his head on full display.Bald Eagle[G] When bald eagles fall for each other, they fall hard. In a spectacular display, the pair soar high in the sky and then lock their talons together, descending through the air. They let go before reaching the ground - usually. There have been cases where the eagles don't release each other in time, resulting in a fatal crash. The risky mating dance is intended to determine whether a potential mate is fit, and once they've passed the so-called test, the pair remains together for life. They construct a home together and return each year to tend a new pair of eggs.1 The National Audubon Society is an American organization of bird lovers and conservationists.2 With the moonwalk, the dancer makes steps like he is walking forward when actually he is gliding backwards.3 Something that is iridescent is shiny with colors of the rainbow.
In the secоnd sentence оf pаrаgrаph G, what are talоns?