The answer is A because I just want to b able to ask another question and it won’t let me w out answering one so there u go
Answer:
The human body have two parts of nervous sytem the peripheral nervous system and the central nervous system
Explanation:
Peripheral nervous system contain all the nerves and ganglion that lies out side of the spinal cord and the brain.These two systems communicate with each other to make the body functional. The main function of the PNS is to connect the CNS to limbs and organs. Unlike the CNS the PNS is not protected by the vertebral column and skull.The peripheral nervous system is divided in to the somatic nervous system and the autonomic nervous system. The autonomic nervous control on the smooth muscles and glands.The connection between the CNS and organs keeps the body in sympathetic or parasympathetic condition.
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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, after Mercury. Named after the Roman god of war, it is often referred to as the "Red Planet" because the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth.
The rotational period and seasonal cycles of Mars are likewise similar to those of Earth, as is the tilt that produces the seasons. Mars is the site of Olympus Mons, the largest volcano, and second-highest known mountain in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System. The smooth Borealis basin in the northern hemisphere covers 40% of the planet and may be a giant impact feature. Mars has two moons, Phobos and Deimos, which are small and irregularly shaped. These may be captured asteroids, similar to 5261 Eureka, a Mars trojan.
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The answer is covalent bond
Answer:
If natural selection over the time period of Eukaryote evolution has favored a DNA architecture in Eukaryotes that keeps genes turned off except when needed, this structure would be nucleosomes.
Explanation:
The nucleosome is the fundamental unit of "packaging" of eukaryotic DNA. This structure contains chromatin, which is a fundamental substance of the cell nucleus and consists of the combination of DNA with proteins. In eukaryotic cells the structure of chromatin is the organization in which DNA is presented in the cell nucleus, and is responsible for masking (protecting) certain sequences, while allowing free access to identical ones. Local chromatin has effects on gene expression, forming special structures that actively bring amplifiers closer to promoters. The active or open chromatin may contain regulatory sequences, promoters, transcribed sequences and regions bound to insulating chromatin proteins. Heterochromatin is a chromatin that is usually located in the vicinity of the nuclear envelope, here genes that are not normally expressed are located, although there are portions of DNA in the constitutive heterochromatin that are transcribed.
