BIOLOGY HIGH SCHOOL

What are two of the things human ancestors used the sky for?

Answers

Answer 1
Answer:

Two things human ancestors used sky for

  • Time
  • Direction

What is the meaning of ancestor ?

An ancestor, also known as a forefather, fore-elder or a forebear, is a parent or the parent of an antecedent.

How do ancestors determine time ?

When two merkhets were aligned with the North Star, they formed a celestial meridian in the sky. The time could then be determined by counting how many stars crossed this line.

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Answer 2
Answer: They used the sky as a timing system to tell the time because back then they didnt have watches. In the slavery times, the slaves used the starts to tell which way was north and south to get to freedom.

Related Questions

Vegetable farmers often plant soybeans every few years. Rotating crops breaks up the life cycles of many insect pests, and the soybean plants provide the soil with nitrogen. Other crop plants need the nitrogen to grow well. A field of soybean seeds has been planted on a farm in Indiana. As soon as the first leaves emerge from the seed, photosynthesis begins. Which substance is the chemical food source for the soybean plants? A. sunlight B. Glucose C. Carbon Dioxide D. Water
A drug that is created by slightly modifying the molecular structure of another substance is a(n) __________ drug.
Which organ in the human body plays a dual role in both the digestive and respiratory systems? A) Liver. B) Lungs. C) Stomach. D) Pancreas.
Choose the sentence that has the most traditional syntax.A. Chewing a ragged nail and checking her watch, she jiggled her leg up and down. B. Jiggling, her leg moving, checking her watch, she chewed her nail. C. Checking her watch, her leg jiggling up and down, she chewed a ragged nail. D. As her leg jiggled up and down, she chewed a ragged nail and checked her watch.
Which term describes a single female arctic fox?biome species ecosystem organism

Explain how trees help maintain air quality.

Answers

Answer:

Trees maintain the air quality by the process of

  • Photosynthesis: maintain the gas balance in the atmosphere.
  • Reducing the greenhouse effect

Explanation:

Tress removes the carbon dioxide and it adds oxygen which maintains the balance of the gases in the atmosphere, during the process of photosynthesis which maintains the quality of the air we breathe.

Carbon dioxide is removed from the atmosphere by the trees when they perform photosynthesis,  which helps to reduce the greenhouse effect which is caused because of the high level of carbon dioxide present.

They also remove the particulates matter present in the air, which maintains the air quality.

Thus these are some ways by which trees help to maintain the air quality.
Trees "breath" in carbon dioxide and exhale oxygen during the morning, so they clean all the carbon dioxide that we breath out daily
But I have to warm you, tree does the opposite at night, if you sleep in a room with a lot of plants, you could be in danger because tree inhale oxygen and exhale carbon dioxide, they soon will consume all your oxygen XD  

A rare chronic disease characterized by abnormal enlargement of the extremities caused by the excessive secretion of growth hormone after puberty is ____.

Answers

Final answer:

The chronic disease that causes abnormal enlargement of the extremities due to excessive secretion of growth hormone after puberty is known as acromegaly. This disorder is due to imbalances in growth hormones, causing abnormal growth in adults, notably in the bones of the face, hands, and feet.

Explanation:

The rare chronic disease characterized by abnormal enlargement of the extremities caused by the excessive secretion of growth hormone after puberty is referred to as acromegaly. The disease is due to the dysfunction of the endocrine system's control of growth, resulting in different disorders.

In acromegaly, excessive GH is secreted in adults who have stopped growing. This causes the growth of bones in the face, hands, and feet. A similar condition in children, triggered by abnormally high levels of GH, is gigantism resulting in excessive growth. A balanced production of growth hormone is essential for proper development, and any imbalances can lead to such conditions.

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Learning Task 5: Write at least five benefits derived from planting treesand fruit bearing trees to families and communities.
1________________
2_________________
3__________________
4____________________
5_____________________​

Answers

1. save more money!
2. you get natural fruits!

A single molecule has at least how many atoms

Answers

The single molecule has at least two atoms.

A single molecule has at least 2 atoms.

For example, the oxygen we breathe has only 2 molecules.

Happy to help :)

What are the 3 levels of diversity.

Answers

Hi

The 3 level of diversity are

1) Genetic diversity

2) species diversity

3) Ecosystem diversity


I hope this answer help !

At what time of the year are most of the animals living in a temperate forest likely to reproduce? (1 point) In fall or winter to take advantage of food that grew in summer Generally in winter since food can be stockpiled and adults can rest At any time during the year since food is equally available all year In spring and summer to coincide with the growing season

Answers

They reproduce in spring and summer to coincide with the growing season. Food grows in the spring in summer because it is warmer and is a perfect climate for plants. In winter and fall, most plants die and food is scarce. That is why animals go into hibernation.

Answer:

The answer is A in spring and summer

Explanation:
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The energy expended to digest, absorb, and further process nutrients in food is called the ________. This equals approximately ____% of energy intake. A) Thermogenic effect; 5% B) Basal metabolic rate; 10% C) Digestive efficiency; 20% D) Specific dynamic action; 25%
Air pressure is _____.A. gravity's pull on air molecules B. higher the farther you are from earth's surface C. about 5 lbs per square inch at sea level D. difficult to measure