Answer: B. to reduce water loss from leaves in dry climate.
Explanation:
Spiny or needle shaped leaves is a kind of adaptation in plants which is typically seen in plants that survive in dry climatic conditions. The needle shaped leaves reduces the surface area of the leaves which prevents the loss of water through transpiration.
A) nervous system
B) a mouth
C) stinging cells
D) spicules
Answer:
A mouth
Explanation:
The answer is that cnidarians lack triploblastic development. Cnidarians, such as jellyfish, sea anemone, and hydra, exhibit diploblastic development. This means that they have only two germ layers: the ectoderm and the endoderm. To understand triploblastic development, let's break it down. Triploblastic development refers to the formation of three germ layers: the ectoderm, the mesoderm, and the endoderm. These germ layers give rise to different tissues and organs in the body. In contrast, cnidarians lack the mesoderm layer. The mesoderm layer is responsible for forming muscles, connective tissues, and other internal structures. Since cnidarians do not have this layer, they are considered diploblastic. Let's use an example to illustrate this. Imagine you have a triploblastic organism, like a human. In a human, the mesoderm layer gives rise to muscles, which allow us to move. But in cnidarians, since they lack the mesoderm layer, they do not have true muscles. So, to summarize, cnidarians lack triploblastic development because they do not have the mesoderm layer. Instead, they exhibit diploblastic development, with only two germ layers: the ectoderm and the endoderm
Answer: The correct answer- is Heredity.
Heredity can be described as the passing of traits/ characteristics from parents to their next generation that is to their offspring via means of either sexual or asexual reproduction.
The traits ( such as eye color, hair color, skin color) are passed in the form of genes ( segment of DNA corresponding to particular trait), which are considered as the unit of heredity.
The process of passing traits from parents to offspring is known as heredity.
Heredity involves the transmission of genetic information encoded in DNA from one generation to the next. It occurs through the combination of genetic material from both parents during reproduction.
The genetic information contains instructions for the development and functioning of an organism, determining its physical and physiologicalcharacteristics.
Heredity is the basis for the inheritance of traits, including physical features, behavior, and susceptibility to certain diseases, among other genetic characteristics.
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(1) simple, single-celled organisms
(2) simple, multicellular organisms
(3) complex, single-celled organisms
(4) complex, multicellular organisms
Many scientists believe that life on Earth started with simple, single-celled organisms. Therefore, the correct statement is option A.
Single-celled organisms are unicellular organisms that contain only one cell and form the most ancient part of life. They can be prokaryotic or eukaryotic organisms.
Life on earth began with simple, single-celled organisms which are usually prokaryotes, such as bacteria and constitutes the most abundant type of organisms on earth. Prokaryotes lack a nucleus and membrane-bound organelles.
By this time, these single-celled organisms evolved to form more complex organisms. Multicellular organisms first evolved around 1 billion years ago, but they are still considered simple to the organisms present today.
Therefore, simple, single-celled organisms are the first to live on earth billions of years ago.
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