The United States are entirely located in the Northern Hemisphere. It is bordering Canada on the north, and the air masses that form over it have big influence on the climate of the United States. Most of the United States falls under the influence of the air masses coming from the north, with only the southern parts of the east and west coastlines not being heavily affected. The air masses that form over Canada are cold continental air masses. They move towards south, thus toward the United States in November, quickly pushing the warmer air masses, and replacing them, bringing in cold weather conditions, which last until March.
Answer:
Watching a baby hummingbird grow up can be a very rewarding experience. Knowing what to look for will help you understand what the hummingbirds are doing and why they are doing it.
Costa's Hummingbird, Calypte Costae, Nest with Eggs, California, USA
Baby hummingbirds are hatched out of hummingbird eggs. When a mother hummingbird is laying an egg, she can be seen sitting on her nest and shaking alternated by wiggling every few seconds. Mother hummingbirds will usually have two eggs laid on different days. The little eggs will be about the size of a pea or small jellybean. Even though the eggs will be laid on different days, both the eggs will usually hatch on the same day. The mother hummingbird can do this by not completely starting the incubation process until the second egg is laid.
The female hummingbird is the only one who will care for these little eggs. A male hummingbird does not assist with any of the childcare. In fact, if a male hummingbird comes around, the female hummingbird will consider his brightly colored feathers a threat that will attract predators and will chase him away.
The hummingbird eggs will remain in the nest incubating for approximately 16-18 days before they hatch. If the weather is cooler it may cause them to hatch a few days later. While the eggs are incubating in the nest, the mother hummingbird will sit on eggs to keep them at a constant temperature of 96 degrees.
Explanation:
B. atmosphere since the atmosphere is made up of o2, co2 (a greenhouse gas) and nitrogen. those are the primary elements
