Planet Earth contains three compositional layers- CORE‚ MENTLE & CRUST. Core: At the centre is the densest of the three layers‚ the core. The core is a spherical mass‚ composed largely on metallic iron‚ with lesser amount of nickel and other elements. Mantle: The thick shell of dense‚ rocky matter that surrounds the core is mantle. The mantle is less dense than the core but denser than the outer most layer‚ the crust. Crust: Above the mantle lies the thinnest and outermost layer‚ the crust
Premium Earth Water Plate tectonics
meaning where they live. To live in a basic habitat an organism must have access to the basic requirements necessary for growth and reproduction. The environment supplies these requirements. The environment of organisms consists of both abiotic factors and biotic factors.
Premium Biology Ecology Organism
building materials)‚ regulating services (the ability of plants to remove human-added carbon dioxide from the atmosphere)‚ support services (pollination of crops) * Intrinsic: no direct benefit but the belief that individuals‚ species‚ and ecosystems are inherently valuable in themselves and we have an obligation to preserve them * The world has experienced 5 major extinctions during the past 500 million years and we are currently in another * Extinction – when the last member of a species
Premium Extinction Endangered species Biodiversity
Meiosis is the type of nuclear division that occurs to form four genetically different gametes. This produces genetically different offspring which all differ in traits‚ the reason this occurs is because of the way that the chromosomes are handled to make gametes. The general gist of meiosis is that a homologous pair is split twice to make four separate cells that have the haploid number of chromosomes meaning when they fuse with other gametes they form a zygote with the diploid number of chromosomes
Premium Genetics DNA Gene
are Natural Resources? 4. There are various methods of categorizing natural resources‚ these include source of origin‚ stage of development‚ and by their renewability. On the basis of origin‚ resources may be divided into: (f) Biotic – Biotic resources are obtained from the biosphere (living and organic material)‚ such as forests and animals‚ and the materials that can be
Premium People's Republic of China Economy of the People's Republic of China Natural resource
Each has four chemicals which are Adenine‚ Guanine‚ and Cytosine; but here is where is changes: DNA has Thymine and RNA has Uracil. DNA is in all biotic things because one of the seven (or eight) traits of life is cells; which only biotic species contain. For instance‚ a rock doesn’t have cells‚ only minerals; therefore‚ a rock is abiotic. Biotics contain DNA‚ and DNA is made of nucleic acids (which are polymers because they are many). Nucleic acids are made of many monomers called “nucleotides”
Free DNA RNA
Nervous System The nervous system is the part of an animal’s body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. In most types of animals it consists of two main parts‚ the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves‚ which are long fibers that connect the CNS to every other part of the body. The PNS includes motor
Premium Atom Proton Neutron
Exercise 1: The Organism and Its Environment GUIDE QUESTIONS 1. a. In the first part of the exercise conducted‚ the abiotic factors influencing the forest and the grassland community were measured. Despite the two sites being in close range of each other‚ they have significant differences that set them apart from each other. Table 1.1 shows the comparison between the two communities. The four factors measured were air temperature‚ soil temperature‚ light intensity‚ and relative humidity
Premium Light Biotic component Beetle
5.3.3 ELECTRICAL ENERGY a) Design‚ construct and draw circuits containing a number of components- (globe‚ closed switch‚ open switch‚ ammeter‚ voltmeter‚ battery or transformer) What is electricity? A form of energy resulting from the existence of charged particles either statically as an accumulation of charge or dynamically as a current. What is a conductor? Materials that permit electrons to flow freely from atom to atom and molecule to molecule. An object made of conducting material will
Premium Newton's laws of motion Atom Plate tectonics
the structural form and nature of the habitat for animals. (Odum‚ 1997). The climate‚ soil-types and animal life are all constituents of a Biome. There can be numerous ecosystems in any single Biome. This is due to the fact that there are many different types of food chains and energy transfers between the various Biotic and Abiotic entities as well as different Flora and Fauna‚ which all co-exist‚ dependent on each other for their own survival (Kalman‚ 1997). Odum (1997) said that a Biome
Premium South Africa South Africa Plant