7. Explain how protist are thought to have given rise to multicellular organisms.
Protists belong to the group eukaryotes (having their DNA enclosedinside the nucleus). They are not plants, nimals or fungi but they act likeone. They can be in general subgroups such as unicellular algae, protozoa andmolds.
Lots of insects eat plants, some insects eat other insects, and some even drink blood. Many insects eat nectar from plants. And some insects will eat whatever scraps of food you leave lying around. A few insects, such as mayflies and some moths, never eat.
The mass extinction that led to the loss of 96% of marine life and 70% of terrestrial life was most likely due to a supernova, an asteroid impact or __________.
The mass extinction that led to the loss of 96% of marine life and 70% of terrestrial life was most likely due to a supernova, an asteroid impact or Volcanic Eruption.
What is Mass extinction?
An extinction event is defined as a widespread and rapid decrease in biodiversity on Earth. Those events are characterized by sharp changes in the diversity and abundance of multicellular organisms that occur when extinction rates increase relative to background extinction rates and species evolution rates.
This mass extinction which happened during the end of the Permian era. The extinction of 96 percent of all marine species and 70 percent of all terrestrial species resulted in catastrophic changes on Earth, which became almost devoid of all species.
The cause of this mass extinction is related to volcanic activity, supernova or asteroid impact which could have increased the average temperature of the Earth's surface.
Thus, the mass extinction that led to the loss of 96% of marine life and 70% of terrestrial life was most likely due to a supernova, an asteroid impact or Volcanic Eruption.
7. did NOT contribute to the mass extinction that ended the Paleozoic era.A. A meteorite impact B. Widespread ice sheets C. The formation of Pangaea
When faced with a sudden drop in environmental temperature, an endothermic animal will ________.experience a drop in its body temperature wait to see if it goes lower increase muscle activity to generate heat add fur or fat to increase insulation
Answer: The correct answer would be increase muscle activity to generate heat.
Endothermic animals are those which maintain their body temperature mainly by their metabolic activity irrespective of environmental heat.
In case, there is a drop in environmental temperature then endothermic animals increase their metabolic activity and metabolize sugars and fats at a faster rate.
It release more heat and increase the body temperature.
One the various methods for increasing metabolism is increase in muscle activity such as done in shivering. Shivering increases muscle activities which increases body temperature.
An endothermic animal would increase muscular activity to generate heat in response to a sudden drop in environmental temperature. This internal heat production is part of their physiological adaptation to maintain stable body temperature in varying conditions.
When faced with a sudden drop in environmental temperature, an endothermic animal will typically increase muscle activity to generate heat. Unlike ectothermic animals, endotherms maintain a stable internal body temperature despite changes in the environment. They are capable of doing this because they generate their own heat internally, often through processes like muscular activity including shivering. Therefore, in an attempt to sustain a constant body temperature when exposed to a colder environment, muscular activity within the animal would increase to produce more heat. This, in turn, helps to counteract the cooling effect of the lower external temperatures.
Major centers concerned with autonomic control of breathing, blood pressure, heart rate, and digestive activities are located in the A) medulla oblongata. B) pons. C) midbrain. D) diencephalons. E) cerebellum.
Medulla oblongata. (Ans. A)
Medulla oblongata is present in the brain, in front of the cerebellum. It controls the number of functions in the body. It helps to transfer messages to the thalamus & spinal cord, from the body.
Medulla oblongata helps to regulate breathing, blood pressure, heart rate, sneezing, and digestive activities. Medulla oblongata part of the brain is a center for respiration & circulation. Sensory & nerve cells from the midbrain & forebrain travel through the medulla. It receives its blood supply from many arteries (including anterior spinal, posterior inferior cerebellar and the vertebral artery's)
The medulla oblongata in the brain controls crucial autonomic functions like breathing, blood pressure, heart rate, and digestion.
The major centers concerned with autonomic control of breathing, blood pressure, heart rate, and digestive activities are located in the medulla oblongata (option A). The medulla oblongata is an important part of our brainstem, located just above the spinal cord. It is crucial as it controls various autonomic functions such as breathing, heart rate, blood pressure, and digestion.
Scientists must be able to repeat an experiment and get very similar results; otherwise their conclusions will be questioned. Ifthe results of a repeated experiment are different from the original results, the results of the experiment lack bias are precise. lack controls. are flawed.