Earth is tilted on an axis and spins around to give us our 24 hour days, however it also rotates around the sun to give us 365 days a year. The tilt is what shows us the 4 seasons. So take North America for example. In the winter North America is tilted away from the sun making the weather colder because we are further away from the sun. and opposite in the summer time. The weather is always warm near the equator because of its location in the middle of earth. so its distance from the sun is always lost the same.
Chromatin condenses into chromosomes
The effect of histamine on parietal cells would best be described as Paracrine
Explanation:
Cell to cell involves the signal transmission from a “sending cell to a receiving cell”. Basically, four types of chemical signalling which is found in multicellular organism. Paracrine signalling, autocrine signalling, endocrine signalling and signalling by direct contact.
Those cells that are near to each other and communicate through the release of chemical messengers through the space between the cells. in which cells communicate over relatively short distance is called paracrine signalling.
Abiotic factors are factors that include non-living parts of the environment which could be significant or essential to living organisms. Water is a non-living environment and it helps in giving life to plants and other organisms. Thus deemed abiotic.
The common carotid arteries and the vertebral arteries
