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Sergeu [11.5K]
3 years ago
7

Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids?

Biology
1 answer:
Viktor [21]3 years ago
7 0
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What are the characteristics of all living organisms
Komok [63]

Answer:

The characteristics of all living organisms:

  • Cellular organization.
  • Reproduction.
  • Metabolism.
  • Homeostasis.
  • Heredity.
  • Response to stimuli.
  • Growth and development.
  • Adaptation through evolution.

* Hopefully this helps:) Mark me the brainliest :)!!!

3 0
3 years ago
Blood pressure is determined by which of the following components?
mixer [17]

The answer is that the strength of heart contraction and blood volume. It is affected by blood volume, stroke volumes, total peripheral resistance, and HR. It has Increase in any of these will increase blood pressure. Vasoconstriction of arterioles raises blood pressure upstream in the arteries

7 0
2 years ago
Read 2 more answers
1. Introduction:
inna [77]

Answer:

1. Introduction

     a. The<em> Tiktaalik </em>is a fossil that<em> </em>existed about 12 million years before the first tetrapods.

    b. The items homeostatic mechanisms show are continuity and change.

2. Continuity

       a. Our Excretory system is the system responsible for the discharging of waste products from the body.

Explanation:

1 a. Tiktaalik fossil (<em>Tiktaalik roseae</em>), also known as the "fishapod," is a 375 million year old fish fossil  discovered in 2004 in the Canadian Arctic. The fossil displays a mixture of fish and amphibian traits (i.e the pioneer tetrapods). Those tetrapod features in the <em>Tiktaalik</em> marks the earliest appearance of these features in fossil record.

Importance: The discovery of the <em>Tiktaalik</em> fossil explains  a crucial point in the history of life on Earth: i.e it sheds light on when the very first fish ventured out of the water onto land.

b. Continuity in homeostasis implies common ancestry or homology. For example the excretory system in flatworms, earthworms and vertebrates basically serves the same function, and has remained unchanged (save for a few tweaks), over the last few million years.

Change implies changes in the environment which causes changes in homeostatic mechanisms. For example the transition of aquatic animals from water to land which necessitates changes in their respiratory mechanisms.

2. Continuity

a. The excretory system is the system of an organism's body that is responsible for the function of excretion, the process of eliminating bodily wastes produced by homeostasis.

The mechanisms of homeostasis are body temperature, body fluid composition, blood sugar, gas concentrations, and blood pressure.

The organs that are involved in this process of waste elimination are the sweat glands, the liver, the lungs and the kidneys.

5 0
3 years ago
Which process in respiration happens last?
vodomira [7]
The answer is c. Electron transport chain
8 0
3 years ago
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The evolution of the modern horse with a single hoof on each limb from a dog-sized ancestral species with multiple digits is an
erastovalidia [21]

Answer:

Answer is option A.

The evolution of the modern horse with a single hoof on each limb from a dog-sized ancestral species with multiple digits is an example of macro evolution.

Explanation:

In macroevolution, major evolutionary changes occur over a long time period and as a result, a species changes into another species or splits into two new species. Whales descending from a land mammal, fish descending from invertebrates, etc are examples of macroevolution.

Microevolution occurs within a population, where the evolutionary changes take place over a short period of time. This is due to the change in gene frequency by natural or artificial selection. These changes can be observed between one generation and the next generation. Antibiotic resistance shown by certain bacteria, pesticide resistance shown by certain pests in the crops, herbicide resistance shown by ants and mosquitoes, the size of the sparrow in North America (sparrows in warmer places are normally smaller than that in colder places), etc are examples of microevolution by natural selection. The production of a new breed of dog is an example of microevolution by artificial selection. Both macroevolution and microevolution are based on mutation, gene migration or gene flow, selection and genetic drift.

The types of natural selection: Directional selection, stabilizing selection and disruptive selection. The organisms that are better adapted to their environments are favored by natural selection. Stabilizing selection is the most common form of natural selection that favors intermediate phenotypes (non-extreme trait). For example, very short plants in a plant population may not get enough sunlight and very tall ones may get damaged by winds, so medium-height plants are favored. As a result, the number of very tall and very short plants decreases and the number of medium-height plants increases as they survive better.

Another example is the birth weight of humans. The babies having very high birth weight can cause life-threatening complications during delivery and the survival chance of babies having a very low birth weight is very less. Thus, the birth weight of babies is normally maintained within a medium-range by nature.

In a population, the disruptive selection favors both the extreme phenotypes and they survive better than the intermediate phenotypes. For example, the finches with large and small beaks on the Galapagos Islands (the majority of seeds on the islands were either large or small) survived better than the finches with medium-sized beaks.

The directional selection favors only one extreme phenotype over the other extreme and intermediate phenotypes. The neck length of giraffes is an example, where the giraffes with longer necks are favored (they could reach for more food in taller trees) and survive better than those with short and medium necks.

8 0
3 years ago
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