In plant morphology thorns, spines and prickles are all similar type of structures identified by their sharp and stiff ends. Thorns are obtained from shoots. Spines are obtained from leaves and prickles are derived from the epidermis. They all are related to anti-herbivore defense mechanisms of plants.

Gross investment refers to the total expenditure on buying capital goods over a specific period of time. On the other hand, Net investment considers depreciations and is calculated by subtracting depreciation from gross investment.

Octopus refers to an inveterate animal which belongs to the Phylum Mollusca. Octopi is used as a plural form of octopus. ‘Octopi’ is a mistaken plural of octopus.

Snow, sleet and freezing rain are all different types of precipitation that occur during winters. Snow is the frozen precipitation which falls in the form of six sided ice crystals. Sleet falls as ice pallets and can be found bouncing off the wind-shields or roof during the winters. Freezing rain refer to those rain droplets which freeze upon hitting the surface of ground.

Torque (moment or moment of force), the word has been derived from Latin which means ‘to twist’. It is a tendency which measures the amount of force which acts upon a body in order to rotate it about a pivot or axis. Momentum is a property possessed by moving objects and is directly proportional to both mass and speed of the body. It can be described as a quantity which is associated with an object’s resistance to stopping.

Octopus and Jelly fish are both invertebrates. Octopus belongs to the group of cephalopods. Cephalopod means feet around the head. Jellyfish belongs to the Phylum Cnidaria and Class Scyphozoa. Both differ in many aspects like anatomy, diet, etc. Unlike an octopus, a jellyfish does not have any heart, brain or blood.

Linear Momentum is basically used to measure the quantity of motion of an object. It can be simply referred to as mass in motion. Linear moment is a product of mass and velocity, and can be generated in both vertical and horizontal directions. Angular momentum can be considered as the rotational analog of linear momentum. Angular momentum considers both the moment of inertia about an axis as well as the angular velocity about that axis.

Force is defined as any pull or push which is exerted on a body due to the body’s interaction with another object or body. Momentum is basically used to measure the quantity of motion of an object. It can be described as the property of a moving object to keep moving in the same direction, and thus it makes it difficult to stop

Nuclear fission and fusion are two processes in which energy is released. Nuclear fusion takes place by the combination of light nuclei like deuterium and tritium. On the other hand in nuclear fission, a nucleus like Uranium-235 and Plutonium-239 splits into lighter nuclei. Fission is comparatively easy to achieve than fusion. However, fusion emits more energy than fission.

Radioactive Decay is the process by which an atomic nucleus emits elementary particles or fragments. This breakdown of the atomic nucleus results in release of energy as well as matter from the nucleus. Generally, transmutation refers to the act of change from one form to another. In context to nuclear transmutation, it may refer to radioactive, nuclear fission or nuclear fusion where the form of element is changed from one to another.

Snails and slugs, both are invertebrate animals which belong to the Phylum Mollusca. Snails and slugs are closely related. However, the main difference between the two is that snails carry a protective shell on their back and slugs lack a protective shell. However, semi slugs have a small partial shell.

Pyrimidine is a heterocyclic aromatic organic compound composed of nitrogen and carbon. Purine is also a heterocyclic aromatic organic compound composed of a pyrimidine ring fused to an imidazole ring.

Mexico is officially known as the United Mexican States, or Estados Unidos Mexicanos in Spanish. New Mexico is the 47th state of the United States of America. The main difference between the two is that Mexico is a country in North America, whereas New Mexico is a state in the United States of America.