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VashaNatasha [74]
2 years ago
5

BIOLOGY HELP PLS!!!!!!! I DONT KNOW WHAT THIS IS XD

Biology
1 answer:
arsen [322]2 years ago
8 0
The first question is the first option (4 haploid cells; 2 diploid cells).
The second question is the first option also (nitrogen).
If wrong I’m sorry but good luck! Have an amazing day!
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Mucous membranes provide a ____________ barrier at body openings.
butalik [34]
<span>Mucous membranes provide a mechanical barrier at body openings. They also line the respiratory, GI, urinary, and reproductive tracts. Mucous membranes secrete mucus, a slimy substance that traps pathogens. The membranes also have hair-like cilia.</span>
8 0
3 years ago
Variation in a trait is a required condition for natural selection to act on a population for that trait. Assuming a population
iVinArrow [24]

Answer:

1. Mutation

2. Epigenetics

Explanation:

1. Mutation occurs when there is a change in an organism's DNA sequence as a result of mistakes in DNA replication or as a result of environmental factors like smoking. The mutation in a single organism can be passed on to other generations hence causing a genetic variation in the population, this obeys the Darwin's law that inherited traits (genetic) are passed on to other generations

2. Epigenetics are changes in gene expression that doesn't involve changes in the DNA sequences unlike mutation. This changes can be passed on to other generations and hence cause a variation in the population. This obeys the Lamarckian evolution that acquired traits are passed on to other generations.

A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.

7 0
3 years ago
Why is cohesion of water important to life on this planet?
uranmaximum [27]
Water molecules stick to the cell walls of plant's thin veins which helps prevent the water from falling backwards due to gravity.
7 0
3 years ago
Find the kinetic energy of a ball of mass 200 grams moving at a speed of 20m/s​
Gelneren [198K]
We have a mass of 200g (0.2kg) moving at 20m/s

Kinetic Energy KE = ½ mv^2 where m is mass and v is velocity

Actually, v is a vector quantity, so KE = ½ mv•v

The dot product of 2 vectors a and b is abCosθ where θ is the angle between the vectors.

Obviously v•v = v^2 Cos0 = v^2

In this case, we have KE = ½ (0.2)(20^2) = 40kg-m^2/s^2 = 40J

So we have kinetic energy in the amount of 40 Joules.
4 0
2 years ago
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Explain why an observer in New York State sees some different constellations in the night sky when Earth is at location A compar
denpristay [2]

Answer:

The Earth is Rotating to another location and shownig different groups of Stars

Explanation:

8 0
3 years ago
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