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Pie
3 years ago
14

A scientist finds an unusual object and decides to study it.

Biology
1 answer:
julia-pushkina [17]3 years ago
7 0


The best answer is B.

The cells of a multi cellular organisms are called eukaryotic cells and have:

1. a membrane-bound nucleus

2. numerous membrane - bound organelles including the endoplasmic reticulum, Golgi apparatus, chloroplasts and mitochondria.

3. several rod-shaped chromosomes.

Because a eukaryotic cell's nucleus is said to be surrounded by a membrane, it is said to have a true nucleus.  Organelles (meaning "little organ")  have specialized cellular roles just like the organs of  the body have specialized roles.


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Describe how hibernation has helped bear species to survive.
Ierofanga [76]
Hibernation helps animals survive the changing seasons. Foods that bears eat, such as berries and flowers, are much less available during cold winter months. When they hibernate, bears enter a deep sleep. ... While they sleep, the bears can survive because their bodies live off of their stored fat or food.

During hibernation, the animal’s body temperature, heart rate and breathing rate all drop to significantly lower levels. Animals do this to survive the winter because the weather is cold and food is scarce. It is advantageous because these animals can quite literally shut themselves off for weeks at a time rather than try and survive through harsh weather conditions.

While many people think bears are hibernators, they actually participate in a similar, though not exact, practice. Instead of hibernating, bears fall into a deep sleep called torpor. During torpor, heart rate and breathing rate decreases, body temperature reduces slightly and bears do not eat or release bodily waste. Bears can sleep more than 100 days without eating, drinking, or passing waste!

Bears sleep in dens that they make themselves, as well as in hollow trees, caves and dens built by other bears. A den can be built in 3–7 days, however, the timing of den building varies from bear to bear. While some bears build their dens months before hibernation season, others choose to excavate their dens.

These animals can dramatically drop their body temperature to below freezing—salty body fluids work to prevent tissue crystallization in particularly cold temperatures.

So really, animals that are true hibernators don’t actually sleep through the entire winter.

The urea produced by their fat metabolism is broken down and the nitrogen is re-used by the bear to rebuild protein.
6 0
2 years ago
Read 2 more answers
Which kingdom or supergroup is characterized by organisms that are heterotrophic by ingestion?
Akimi4 [234]
The kingdom described above is the kingdom Animalia. Heterotrophic mode of nutrition is a type of nutrition in which organisms depends upon other organisms such as plants for survival, for example all animals are heterotrophic and obtain all organic materials they need to survive. The other type of nutrition is the autotrophic mode of nutrition in which organisms use simple inorganic substances to synthesize organic molecules, a characteristic of plants. 
5 0
3 years ago
5.What is the role of enzymes in the DNA replication process? A. Enzymes read the DNA code and build a new DNA molecule from scr
Crazy boy [7]
A Enzymes read the DNA code and build a new DNA molecule from scratch
5 0
3 years ago
a paper mill about 16000 gallons of water and about 400 kWh of elctricity to produce one ton of paper cups
Natalija [7]

Answer:

Recycling paper uses 60% less energy than making paper from raw materials. Every ton of recycled paper saves:

·         4,100 kWh of electricity

·         380 gallons of oil

·         4.6 cubic yards of landfill space

·         7,000 gallons of water; and

·         17 trees

Explanation:

4 0
2 years ago
Name and describe the key components of the two major divisions of the nervous system.
defon

The Central Nervous System

     -Serves as the control center for the body

The Peripheral Nervous System

     -Sends information to and from the brain and spinal cord

     -Divided into the sensory somatic nervous system and the autonomic nervous<span> <span>system</span></span>

3 0
3 years ago
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