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trapecia [35]
2 years ago
8

3. How many membranes does the nucleus have?

Biology
2 answers:
vivado [14]2 years ago
5 0
The answer is 2 hopes this helps
Sati [7]2 years ago
3 0

Answer:

2 membrans

Explanation:

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Fully explain in your own words your thoughts on the following questions: Are mutations good or bad for a population?, IN YOUR O
marysya [2.9K]

Answer:

mutations can be either beneficial or harmful depending on the environment

Explanation:

Mutations can be defined as genetic changes in the nucleotide sequence of the genome of one organism. Mutations are usually neutral, but they can also be deleterious and/or beneficial depending on the environment. For example, recessive mutations that cause sickle-cell anemia, which is a recessive genetic disease that affects homo-zygous individuals, have shown to be advantageous for heterozygous individuals living in regions where malaria is endemic. Beneficial mutations can be selected by natural selection, thereby increasing their frequency in the population.

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2 years ago
Is it actually rare to step on an ant? this sounds dumb but I’m curious.
ivanzaharov [21]

Answer: No

Explanation:

i mean it depends if you live near an ant colony or colonies.

3 0
3 years ago
Read 2 more answers
Which statements about the circulatory system of a mollusk are true?
goldenfox [79]
<h3><u>Answer;</u></h3>

A. Gas exchanges takes place by diffusion.

B. It is an open system.

<h3><u>Explanation</u>;</h3>
  • Most molluscs and arthropods have an open type of circulatory system.
  • Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
  • Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
5 0
2 years ago
DUE NOW PLS HELP MEEEE!!!!!
blagie [28]

Each fossil with the layer where it will be present based on are layer A-BIRDS, layer B -dinosaurs , layer C-amphibians, layer D-Corals ,layer E -trilobites.

<h3>What is the oldest fossil layer?</h3>

The Pilbara area of western Australia's Strelley Pool is home to the oldest known fossils. Stromatolites are fossilized mats of microorganisms wedged between sedimentary layers. The fossils have an age of 3.4 billion years.

<h3>How are the layers containing the fossils organized?</h3>

The Law of Superposition, which asserts that in undisturbed rock sequences, the bottom layers are earlier than the top ones, is the foundation for this theory. Because of this, certain fossil discoveries can be dated using the strata—a particular stratum of rock—in which they were discovered.

TO know about fossil Layer visit:

brainly.com/question/11799178

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5 0
1 year ago
Evidence suggests that first, ____________ were acquired when an aerobic bacterium was engulfed by larger cells and became mutua
leonid [27]

Answer:

1. Mitochondria

2. Chloroplast

3. the formation of eukaryotic cells

4. DNA

Explanation:

The theory of endosymbiosis was proposed by the Lynn Margulis in 1967 which suggested that the eukaryotic organelles like the mitochondria and chloroplast evolved when another prokaryotic cell engulfed the prokaryotic bacteria.

The mitochondria were formed when the chemosynthetic bacteria were engulfed by the bacteria and the engulfed bacteria formed a symbiotic relationship. Similarly, the chloroplast was originated in the same way when the photosynthetic bacteria were engulfed by another prokaryote.

The evidence which supports their ar:

1. The same size of the organelles to the bacteria

2. The presence of the circular DNA of the organelles like bacteria  

3. The similarity in the 30s and 70s ribosomal subunits.

7 0
2 years ago
Read 2 more answers
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