Answer:
Ptolemy included epicycles in his orbits.
Explanation:
Ptolomy's model of the solar system was geocentric, where the sun, moon, planets, and stars all orbit the earth in perfectly circular orbits. The problem with perfectly circular orbit around the Earth is that they do not explain the occasional backward motion, or retrograde motion, of the planets.
The Greeks insisted that the motion of the planets be perfectly circular. Ptolemy modeled the planets making small circles around a point that orbited the Earth. These smaller circles were called epicycles, and they allowed the planets to move backward relative to the background stars.
The answer is false, people wouldn't be able to feed themselves
Two spotted leopards produce a litter of four cubs. Three of the cubs are spotted and one is solid black. The black coat is<u> Recessive Trait</u>
Explanation:
A recessive trait is a trait that have been expressed when an organism has two recessive alleles or two forms of a gene.
Traits are called the physical/non-physical characteristics of a organisms that can or cannot be observed.
Physical characteristics like hair, eye color can be observed while other characteristics like the shape of blood cells cannot be observed.
It is important to note that if the trait is dominant, one of the parents will have the trait. Dominant traits does not skip a generation. In case the trait is recessive, neither of the parent will have the trait .Recessive trait can skip a generation
So we can say that in the case mentioned in the question
Two spotted leopards produce a litter of four cubs. Three of the cubs are spotted and one is solid black. The black coat is<u> Recessive Trait</u>
<h2>Clotting factors </h2>
Explanation:
Clot enhancers: calcium ions, fibrinogen, thrombin, vitamin K, PF3, tissue factor
- Calcium ions are required for the fibrin clot formation,also helps in the activation of thrombin from prothrombin
- Fibrinogen is the substrate of thrombin and helps in the formation of a normal blood clot at the site of vascular disruption
- Thrombin converts fibrinogen into fibrin which leads to the formation of a fibrin clot;also causes platelet aggregation
- Vitamin K is the fat soluble vitamin which act as coenzyme,the aromatic ring of Vitamin K undergoes in sequential oxidation and reduction during the formation of active prothrombin
- PF3 comes into action whenever there is platelet activation,it is released and participates in thrombin formation
- Tissue factor helps in the initiation of blood coagulation
Clot inhibitors: heparin, coumadin, aspirin
- Heparin is an anticoagulant which prevents the formation of blood clot,used before surgeries to minimize the risk of blood clots
- Coumadin is also known as Warfarin which is a synthetic compound that inhibits the formation of active prothrombin and cause death of organisms due to constitutive bleeding
- Aspirin is a blood clot inhibitor and helps in preventing cardiovascular events in high risk patients
Serum is called blood plasma without fibrinogens and does not play any role in blood clotting(neither as an enhancer nor as an inhibitor)