Answer:
The UV radiations from sun reaches earth’s surface through the atmosphere. The earth’s surface absorbs some of the heat and emits the heat energy. This emitted heat energy is blocked by greenhouse gases.
Answer: Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive.
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.
The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.
Answer:
The only living characteristic of viruses are that they reproduce but only inside the host body, using its machinery they can mutate and change over time. In the case of retroviruses, DNA can be passed to succeeding generations.
the non living characteristics of viruses include that they are not cells; they lack plasma membrane, cytoplasm and cellular organelles and they can not undergo metabolism. they can not maintain homeostasis as they crystallize out of the host body. they can not grow, just multiply using the host machinery.
considering some facts that viruses can reproduce inside hosts body, and that they can mutate we can say that they are living.
but flipping the coin, viruses are not cells, they lack cytoplasm and organelles and they crystallize out of the host body. We can say that they are non-living.
but up till now biologists place viruses on a border line of living and non living.
Explanation:
Answer: solar energy + carbon dioxide + water → carbohydrate + oxygen
Explanation:
Photosynthesis is the process of reaction of carbon dioxide with water in the presence of energy (sunlight) ,trapped by chlorophyll pigments in leaves, and enzymes , to produce carbohydrate,(glucose) and and Oxygen molecules as by-products; used for cellular respiration
the first step of this reaction is photolysis of water, that is the splitting of water molecules into : protons and oxygen atoms.
2 H2O + 2 NADP+ + 8 photons (light) → 2 NADPH + 2 H+ + O.
this process takes place in the chlorophyll,of leaves and it is called iight dependent reaction
the second stage is called Light independent reaction , because it does not directly depend on light to imitate the mechanisms of reaction.
It simply involves the reduction or fixing of carbondioxide with the ATPs and NADPH produced from above to give intermediate glyceraldehyde-3-phosphate(GAP) which is converted into GLUCOSE . This reaction is also known as CALVIN CYCLE. it takes place in the stroma of chloroplast.
Answer:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change
Explanation: