What is the heart's curculation

1 answer:

3 0

Oxygen locks onto a molecule called hemoglobin in the red blood cells. The newly oxygenated blood leaves the lungs through the pulmonary veins and heads back to the heart. It enters the heart in the left atrium, then fills the left ventricle so it can be pumped into the systemic circulation.

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Select the correct answer. Which statement about natural selection is true? A. Natural selection and evolution are two terms for

Masja [62]

Answer:

C. Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce.

Explanation:

Natural selection is an evolutional process by which species of living organisms with stronger or more beneficial traits have higher chances of survival and reproduction. In other words, it is the process by which organisms adapt and survive.

Organisms in a population are all different in their own ways. And those with characteristics or traits better suited for the environment are more likely to survive than those without. The selection prefers more beneficial traits and not wholly on the superiority of the organism. So, the survival and reproduction chance of an organism depends on the presence of traits beneficial to the environment, which is how nature selects. And in this process, those selected will dominate the population while those rejected will be reduced or even die.

Thus, the correct answer is option C.

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During mitosis, chromatin condenses into chromosomes, spindle fibers form from one end of the cell to the other, and centrioles

katen-ka-za [31]

B Anaphase

explanation: the spindle fiber is used to pull apart the chromosomes

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4 years ago

Clotting begins when a __(1)__ occurs in a blood vessel wall. Almost immediately, __(2)__ cling to the blood vessel wall and rel

Wittaler [7]

Question is incomplete, the complete question is as follows :

Clotting begins when a _________ occurs in a blood vessel wall. Almost immediately, _______ cling to the blood vessel wall and release _____________ which helps to decrease blood loss by constricting the vessel. __________ is also released by damaged cells in the area. This chemical substance causes ________to be converted to ____________. Once present, thrombin acts as an enzyme to atatch ___________molecules together to form long, threadlike strands of _________, which then traps ____________ flowing by in the blood.

Answer:

Clotting begins when a BREAK occurs in a blood vessel wall. Almost immediately, PLATELETS cling to the blood vessel wall and release SEROTONIN, which helps to decrease blood loss by constricting the vessel. THROMBOPLASTIN is also released by damaged cells in the area. This chemical substance causes PROTHROMBIN to be converted to THROMBIN. Once present, thrombin acts as an enzyme to attach FIBRINOGEN molecules together to form long, threadlike strands of FIBRIN, which then traps ERYTHROCYTES flowing by in the blood.

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Ozone, a pollutant or a gas to protect us? We have known that the ozone layer absorbs (slides 12 to 16) most of the sun's ultrav

krok68 [10]

Ozone is good when it is in the stratosphere but bad when in the troposphere (where the weather system occurs). When in the stratosphere it help absorbs UV light from sunlight before reaching earth surface. This prevents damage to the genetic material of living organisms.

When in the troposphere, it is considered a pollutant and causes irritation of the lungs when inhaled. It also affects vegetation by reducing crop growth and yield.

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Which of the following adaptations allowed plants to disperse their offspring more efficiently on land?

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A.seeds because if the seed gets into the ground with water and sunlight then it can grow

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