Why do scientists believe that some tectonic plates are moving away from each other?

1 answer:

8 0

The continents do move as new material from the center of the Earth rises, hardens and pushes older pieces of the Earth away from each other. They called their theory “sea floor spreading.” The theory explains that as the sea floor spreads, the tectonic plates are pushed and pulled in different directions

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A chemical substance that organisms require to live is what

horrorfan [7]

Answer:

Nutrients.

Explanation:

Nutrients are the chemical substances required by any organism to meet the basic requirements of life. The nutrient can be either organic or inorganic, but both are important for the organism.

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Production of oxygen during photosynthesis

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The process that produces oxygen is the photosynthesis and when oxygen is released as the result of its production during photosynthesis, it is a by-product of splitting the water molecules. The reduction of oxygen which forms water occurs during respiration.

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Explain the relationship between cells,tissues,organs, and organ systems

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Cells are the basic building blocks of life, which can join together to form tissues, while different groups of tissues join together to form organs. These organs are then connected together to form organ systems, such as the digestive system, which includes the stomach, esophagus, intestines and other organs.

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1.6 (IB 2017/MAY – SL P1/5C) When during the cell cycle does DNA replication take place?

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Answer:

Mitosis!!!!!!!!!!!!!!

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This type of membrane transport moves substances against the concentration gradient from an area of low concentration to an area

sashaice [31]

Answer:- Active transport

Explanation:-

There are two types of membrane transports

1. Passive transport - this type of transport occurs without the input of any energy and the molecules move along the concentration gradients that is from high concetration to low concentration.

2. Active transport- this type of transport takes place to move the molecules against the concentration gradient that is from low concentration to high concentration.

The active transport is of two types:

1. Primary active transport- in this type of transport ATP is used as an energy source to move the substances against the concentration gradient.

2.Secondary active transport - in this type of transport the gradient formed by the active transport is utilized and it involves the movement of 2 substances at a time aross the membrane. That is the movement of one molecule is coupled to another.

The membrane proteins that are associated with active transport are called as carrier proteins. These proteins have a binding site for the molecules that they transport. Once they bind to the specific molecules, a conformation change is induced and this leads to the transport of the molecule across the membrane.

So, the active transport is basically responsible for utilizing the energy from ATP and carrier proteins to move the substances across the membrane against their concentration gradient i.e. from low concentration to high concentration.

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2 years ago