As human travel increases , the number of introduced species likely increases .
<h3>What is species and how human travelling can increase the number of introduced species?</h3>
- As humans will start moving more from one place to another there will be more species number.
- The number of introduced species will increase sharply seeing the increase in the number of human population doing migration and travelling.
- The breakdown of regional distinctiveness leads to increase in the travelling period of the humans .
- And most importantly the introduction of new species will increase and will be impacted by the human who have come from elsewhere for either travelling purposes or migration purposes.
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Answer:
Basic characteristics of Sponges:
Sponges belong to phylum porifera. They are simple multi-cellular aquatic animals. They have pores in their body thats why they look like sponge we use in kitchen. These pores are known as ostia. The body cavity is known as spongocoel, which open to out side through large pore known as osculum. Their body is composed of two layers, choanocyte and pinacocyte. Choanocytes are flagellated cells having spikes which help in movement of water into body and aid in capturing of food particles. The skeleton is made up of calcium carbonate or silica. A jelly like substance called as mesoglea is present between pinacocyte and choanoderm.
<span>General characteristics of Archeocyathans:
</span> The term archeocyathans is a Greek word for "ancient cup". They have a single common ancestor and became one of the planet first reef animals. S<span>pecies of archeocyathans is divided into two classes, six orders, 12 suborders, 120 families and nearly 300 genera. They are associated with carbonate sedimentation.They generally lived in shallow water with photic zone. Their fossils often co-occured with fossils of cyanobacteria. </span><span>These are marine organisms whose fossils record dated back to late Precambrian and early Cambrian period. They are most closely resemble to calcareous sponges. Their structure s are conical or tubular in shape and superficially resembles horn reefs. They have world wide distribution and found in Australia, Antartica, Spain, Cubec, New york and California,</span>
Answer:
The correct answer is:
Control group and treatment group (b.)
Explanation:
Scientific experiments seek to investigate the association between two variables (independent and dependent). There are various variants of scientific research, but the one described here is the "case control study".
In case control studies, the research subjects are divided into two groups; the experimental groups and the control groups.
The experimental group are the individuals that are exposed to a certain variable (independent variable) or intervention, and they are observed for certain outcomes that are brought about as a result of the exposure.
The control group are the individuals that have approximately the same properties and exposures to the experimental groups except exposure to the independent variable or intervention. The control groups are there to ensure that of a certainty, the observations made on the experimental groups are as a result of the independent variable alone and not other variables. For example in a hypothetical study to determine the impact of a certain skincare product on skin color, the experimental groups are exposed to the product (independent variable) while another set of individuals of same age range, gender etc as the experimental individuals are exposed to every other factor as the experimental group except to the skin care product, this is so that if there is a significant effect on the skin tone of the experimental group but not the control group, it can be said to a scientific degree of accuracy that the change observed was as a result of the skincare product.
Respiratory, when you breathe in and out, oxygen and co2 is exchanged
