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4 years ago

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

Biology

2 answers:

skelet666 [1.2K]4 years ago

7 0

Calenders and time were the two things humans used the sky for.

aleksley [76]4 years ago

6 0

They used it for telling the weather if it was gonna rain or be cloudy or snowy. they also used it to tell the time. if it was dark- it was night. if the sun was rising it was morning.

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Compare surface, subsurface, and placer mining in terms of damage to the environment.

vfiekz [6]

Surface mining, which is also known as strip mining, is when soil and rock overlaying mineral deposit is removed. It can cause habitat destruction, air pollution from dust particles, soil erosion and pollution. Subsurface mining is removing deposits from the Earth by drilling underneath layers of rock and dirt. To keep the pathways clear, <span>mining companies have to pump out large amounts of water, which go into surface ecosystems. That disrupts the ecosystem by changing the pH conditions of soil and water sources. Placer mining is mining of stream bed deposits for minerals, a way of obtaining minerals and metal resources. Although, because it is small, causes less damage to the surrounding environment it still can disrupt river ecosystems with pollution and sediments.

I hope this helps!!

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5 0

3 years ago

Read 2 more answers

What is commensalism

IgorLugansk [536]

Answer:

An association between two organisms in which one benefits and the other derives neither benefit nor harm.

Explanation:

8 0

3 years ago

Read 2 more answers

The constancy of the chromosome number from one cell generation to the next is maintained through.

vesna_86 [32]

Through mitosis, the number of chromosomes is kept constant from one cell generation to the next.

<h3>What occurs during mitosis?</h3>

A cell divides into two identical daughter cells after duplicating all of its components, including its chromosomes. Due to the importance of this procedure, specific genes carefully regulate each phase of mitosis. Health issues like cancer may develop when mitosis is improperly controlled.

<h3>How many phases of mitosis are there?</h3>

Prophase, pro metaphase, metaphase, anaphase, and telophase are these stages.

<h3>What function does mitosis serve?</h3>

Mitosis' purpose is to divide the genome so that the two daughter cells inherit an identical and equal number of chromosomes.

<h3>Where in the cell cycle does mitosis occur?</h3>

The mitotic phase, which consists of mitosis and cytokinesis and produces two daughter cells, begins after interphase. Despite the fact that the two processes frequently overlap, mitosis occurs before cytokinesis.

learn more about mitosis here

<u>brainly.com/question/19058180</u>

#SPJ4

4 0

2 years ago

The Eurasian plate and North American plate are moving away from each other. This is causing the Atlantic Ocean to become wider.

olya-2409 [2.1K]

I’m guessing Asia and North America to be closer

3 0

3 years ago

Individual amoebae of the slime mold Dictyostelium discoideum aggregate to form a spore-producing fruiting body. Cheaters make s

jeka57 [31]

Answer:

It is an example of frequency-dependent selection. Due to several cheaters in the population, the fruiting body's stalk is not made properly. So, all individuals have lesser fitness.

Explanation:

Natural selection:

The population contains both superior as well as an inferior organism where natural resources are limiting so it will cause competition between organisms. As a result of competition, it will select superiors, and inferiors are deleted and they are given reproductive advantages. Due to this reproductive advantage new population emerges. It is more suitable for the environment.

Natural selection divides into three parts that are directional, disruptive, and stabilizing selection.

The given question is the example of frequency-dependent selection. Due to several cheaters in the population, the fruiting body's stalk is not made properly. So, all individuals have lesser fitness. Directional selection will not lead to fixation of cheater genotype. This is because cheating can be controlled through high relatedness in social groups, resulting from kin discrimination.

It is controlled through positive pleiotropy, where the cooperation gene has an additional vital function. Cheating will be controlled if stalk vs. spore is a result of environmental, not genetic factors. An example, spore fate can be a result of the position in the mitotic cell cycle.

6 0

3 years ago