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Dahasolnce [82]
3 years ago
9

What causes our seasons?

Biology
2 answers:
padilas [110]3 years ago
4 0

Answer:

Seasons occur because Earth is tilted on its axis relative to the orbital plane, the invisible, flat disc where most objects in the solar system orbit the sun. ... In June, when the Northern Hemisphere is tilted toward the sun, the sun's rays hit it for a greater part of the day than in winter.

Blababa [14]3 years ago
4 0

Answer:

It is because the earth's spin axis is tilted with respect to its orbital plane

Explanation:

This is what causes the seasons. When the earth's axis points towards the sun, it is summer for that hemisphere. When the earth's axis points away, winter can be expected. I hope it helps you

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A problem that frustrates attempts to organize the entire living world for study: we don't know how many separate __________ of
solniwko [45]
The usual problem that would frustrate attempting to organize entire world for the study is we do not know how many separate species of life forms that usually would exist on this planet. Hope this is the correct answer and this would help.
5 0
3 years ago
A stroke victim has great difficulty moving his right hand and right leg. He also has trouble speaking. Which of his cerebral he
Fofino [41]

Answer:

The correct answer is left cerebral hemisphere.

Explanation:

The left cerebral hemisphere of the brain is accountable for the motor control of the right side of the body, for sensory stimulus from the body’s right side, for analysis and calculations, for the speech, comprehension, and language, for the recognition of letters, words, and numbers, and for time and sequencing.  

The left cerebral hemisphere is accountable for the processing of the sensory information and motor information for the body’s right side. Thus, as left cerebral hemisphere monitors the movement of the body's right side, so, based on the extremity of the stroke, which may result in motor skill impairment or functional loss of the right side of the body, shows that the left side of the brain has got affected.  

6 0
3 years ago
A genetic carrier is someone who
Nat2105 [25]

Answer:

The correct answer is option B. has a defective allele and normal phenotype.

Explanation:

Genetic carrier or the hereditary carrier is an organism or a person that has a recessive allele for a particular trait or character (generally mutation) but does not exhibit the trait or any character related to the trait.

The carriers are normal in the sex-linked characters in comparison to the autosomal traits. Females are generally the carrier for sex-linked characters and carry the allele to the next generation.

Thus, the correct answer is option B. has a defective allele and normal.

3 0
3 years ago
4. Analyze Explain why the form of
trapecia [35]

Analyze Explain why the form of  reproduction is given below

Explanation:

1.Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete (such as a sperm or egg cell) with a single set of chromosomes (haploid) combines with another to produce a organism composed of cells with two sets of chromosomes (diploid).

2.Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants.

3.Sexual reproduction does not occur in prokaryotes (organisms without cell nuclei), but they have processes with similar effects such as bacterial conjugation, transformation and transduction, which may have been precursors to sexual reproduction in early eukaryotes.

4.In human reproduction, each cell contains 46 chromosomes in 23 pairs. Meiosis in the parents' gonads produces gametes that each contain only 23 chromosomes that are genetic recombinants of the DNA sequences contained in the parental chromosomes. When the nuclei of the gametes come together to form a fertilized egg or zygote, each cell of the resulting child will have 23 chromosomes from each parent, or 46 in total.

5.In plants only, the diploid phase, known as the sporophyte, produces spores by meiosis that germinate and then divide by mitosis to form a haploid multicellular phase, the gametophyte, that produces gametes directly by mitosis. This type of life cycle, involving alternation between two multicellular phases, the sexual haploid gametophyte and asexual diploid sporophyte, is known as alternation of generations.

6.The evolution of sexual reproduction is considered paradoxical, because asexual reproduction should be able to outperform it as every young organism created can bear its own young. This implies that an asexual population has an intrinsic capacity to grow more rapidly with each generation.This 50% cost is a fitness disadvantage of sexual reproduction. The two-fold cost of sex includes this cost and the fact that any organism can only pass on 50% of its own genes to its offspring. One definite advantage of sexual reproduction is that it impedes the accumulation of genetic mutations.

7.Sexual selection is a mode of natural selection in which some individuals out-reproduce others of a population because they are better at securing mates for sexual reproduction.It has been described as "a powerful evolutionary force that does not exist in asexual populations

4 0
3 years ago
Which are true of BOTH DNA and RNA?
mote1985 [20]

Answer:

both can be found in all living things

3 0
2 years ago
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