Describe two areas in the world that use primarily renewable energy technologies. Describe the type of energy they use.

1 answer:

6 0

Answer: China and Brazil both use hydropower and are both two of the top countries in the world using renewable energies to power their nations.

Explanation: With china in first place and brazil in third, these two countries are among the top three nations who produce the most renewable energy, and they do this primarily with hydropower which harnesses energy from water currents and converts it into electricity.

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Samples as small as a few skin cells can potentially contain DNA. T/F

Travka [436]

Answer: True

Explanation:

DNA (Deoxyribonucleic acid) is the genetic material present inside the nucleus of all eukaryotic cells.
Samples as small as few skin cells also contain DNA and the presence of DNA in skin cells is often used to identify the DNA of a person in a crime scene.
Further, with the use of PCR technology, the small amount of DNA obtained from skin cells can be amplified into many copies.
Therefore, the given statement is true.

8 0

3 years ago

Which statement provides an example of epigenetics A. Genetic mutations arising every other generation B. Selective breeding of

irina [24]

Answer: d. mothering style affecting the developing brain

Explanation:

Epigenetics is the study of features or "phenotypes" which do not involve changes in the DNA sequence. Epigenetics is about how genes are expressed and used instead of the DNA sequence of the genes themselves.

The behaviour of a person's genes depends not only on the DNA sequence of the genes, but also on so-called epigenetic factors. Effects on genes from the external environment can affect disease, and some of these effects can be inherited in humans.

So, Mothering style which affects the brain development is an exampe of epigenetics which do not show any genetic feature.

Hence, the correct option is d.

6 0

2 years ago

Why is the menstrual cycle an important adaptation for reproduction in humans?

raketka [301]

The menstrual cycle is practically controlled by a system of hormones that is necessary for reproduction, and when the hormone reaches a heightened level, something called estradiol is made, then the stimulation of the ovaries by a luteinizing hormone.

Once that hormone begins developing, the ovaries make an egg that quickly becomes an ovum. The ovary then releases one egg or two during ovulation. The endometrium (the part that sheds its own cells for the menstruation) peaks after ovulation and changes the lining of the uterus to prepare for the hectic process of pregnancy and child labor.

Hope that was helpful.

5 0

3 years ago

Creating hypotheses based on observations.A hypothesis is a general principle or explanation that is derived from observations.

Alex17521 [72]

Answer:

False
True
True
False
False
True

Explanation:

A hypothesis is a supposition draw from data to carry an investigation or an argumentation.

1. The onion cells I looked at have a nucleus. False, even though the statement is true, is not a hypothesis because is not a supposition, it is rather an observation.

2. All onion cells have a nucleus. True, it is s a valid hypothesis because after the observation of 10 cells you draw a conclusion or supposition and affirm that all onion cells have a nucleus.

3. All cells have a nucleus. True, it is a valid hypothesis it contains a supposition derived from data observation

4. Some cells have a nucleus. False, the hypothesis is not valid because all of the observed cells contained nucleus not only some of them.

5. Only onion cells have a nucleus. False, after the observation of the different type of cells you see that they all had nucleus.

6. If I look at 10 skin cells from my hand, each one will have a nucleus. True, after the observation of different cells you can infer that if you look at your skin cells, they will have a nucleus.

6 0

3 years ago

The diagram below shows a newspaper headline.

Bingel [31]

Answer: a hypothesis.

A hypothesis means a theory or a guessed explanation made, based on limited evidence as a starting point for further investigation.

4 0

3 years ago