Brothers, Patrick and Michael, do not look very much alike. Patrick has green eyes and blond, curly hair like his mother. Michael has blue eyes and dark brown, straight hair like his father. These directly observable characteristics are a) phenotypes. b) genotypes. c) chromosomes.d) DNA.

Answer: The correct answer is- This relationship is one of example of  mutualism.

Mutualism can be described as a biological interaction between two species that live in close association with each other in a way that both the partners are benefited from each other. It is a type of symbiotic relationship.

Lichen shows mutualistic relationship between algae and fungus, where photosynthetic algae provides food source to the fungi and fungi in return provides protection to algae as well as provides nutrients from the surrounding.

Thus, it is an example of mutualism.

Radioactive tracers are useful in determining medical problems.

Answer: B. Determining medical problems.

Explanation:

Radioactive tracers are comprised of carrier particles that are reinforced firmly to a radioactive atom. These bearer particles shift incredibly relying upon the motivation behind the scan.

A few tracers utilize atoms that associate with a particular protein or sugar in the body and can even utilize the patient's very own cells.

Examples of radioactive tracer are - tritium, carbon-11, carbon-14 and oxygen-15 and so forth. Radioactive tracers are either injected in the body intravenously or orally.

Anything that has mass and takes up space is called matter. Matter is the term used to describe anything that possesses mass and occupies space.

Matter is a term used in the field of physics and chemistry to describe anything that has mass and occupies space. It refers to all substances and materials that we encounter in our daily lives, including solids, liquids, and gases.

The concept of matter is based on the understanding that everything in the physical world consists of tiny particles called atoms or molecules. These particles are the building blocks of matter and are constantly in motion.

The mass of an object refers to the amount of matter it contains, which determines its inertia and gravitational attraction. The space occupied by an object refers to its volume, which can be measured or observed in terms of its dimensions or displacement of other substances.

Matter exists in various forms and states, ranging from the solid state (e.g., rock, metal) where particles are closely packed together, to the liquid state (e.g., water, oil) where particles are more loosely arranged and can flow, to the gaseous state (e.g., air, oxygen) where particles are widely spaced and move freely.

Understanding matter and its properties is fundamental to the study of chemistry, physics, and other scientific disciplines. By examining the behavior and interactions of different types of matter, scientists can gain insights into the structure of substances, the nature of chemical reactions, and the principles governing the physical world.

In summary, matter is the term used to describe anything that possesses mass and occupies space. It encompasses all substances and materials in different states and is the subject of study in various scientific fields.

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Variousscope of biology are as follows:

B.Pharmacy, Homoeopathy, MBBS, Ayurveda,Nursing,Para- medical field,Nutritionist,Hospital and helt administarion, Phamaceutical science,Veterinary science, Agriculture, Life/biological science, Clinical research, B.H.M.S, B.D.S, B.Sc Biotechnology, B.SC Biology, B.SC Microbiology etc.

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