1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zigmanuir [339]
2 years ago
7

1. Why does the angle of the sun at noon seem to change at different months throughout the year?

Biology
1 answer:
jolli1 [7]2 years ago
4 0

Answer:

1. The earth orbit is slightly elliptical, and the earth axis is tilted by roughly 23.5° to the orbit. These to factors combine to make the an analemma. But in the winter, When the Earth is on the other side of orbit, the Earth's north pole is tipped away from the Sun, so at noon the sun doesn't get as high.

2. The earth's spin axis is tilted with respect to it's orbital planet. This is what causes the season. When the earth's axis points towards the sun. it is summer for that hemispheres. Midway between these two times in spring and autumn, the spin axis of earth points 90 degrees away from the Sun.

You might be interested in
In pea plants, Round is dominant to Wrinkled and Yellow is dominant to green. If two pea plants that are both heterozygous for b
Natasha2012 [34]

Answer:

the answer is

Explanation:

3 0
2 years ago
How do crosscutting concepts help unite the study of biology?
mrs_skeptik [129]

The Framework identifies seven crosscutting concepts that bridge disciplinary boundaries, uniting core ideas throughout the fields of science and engineering. ... A major activity of science is investigating and explaining causal relationships and the mechanisms by which they are mediated.

3 0
3 years ago
Read 2 more answers
What type of muscle aids in the digestion of food apex?
zmey [24]
The correct answer is "<span>a layer of smooth </span><span>muscle".

</span>In an individual's mouth, gut, and the small intestine, the mucosa, which holds tiny glands, which secrete juices in order to assist in digesting food<span>. The </span>digestive<span> tract also holds a layer of smooth </span>muscle, which <span>aids in breaking down </span>food<span> and move it along the digestive tract.</span>
3 0
3 years ago
Read 2 more answers
Why are some pathogenic bacteria able to make toxins?
Angelina_Jolie [31]
A pathogen is a microorganism that is able to cause disease in a plant, animal or insect. Pathogenicity is the ability to produce disease in a host organism. Microbes express their pathogenicity by means of their virulence, a term which refers to the degree of pathogenicity of the microbe. Hence, the determinants of virulence of a pathogen are any of its genetic or biochemical or structural features that enable it to produce disease in a host.

The relationship between a host and a pathogen is dynamic, since each modifies the activities and functions of the other. The outcome of such a relationship depends on the virulence of the pathogen and the relative degree of resistance or susceptibility of the host, due mainly to the effectiveness of the host defense mechanisms. Staphylococcus aureus, arguably the most prevalent pathogen of humans, may cause up to one third of all bacterial diseases ranging from boils and pimples to food poisoning, to septicemia and toxic shock. Electron micrograph from Visuals Unlimited, with permission.

The Underlying Mechanisms of Bacterial Pathogenicity

Two broad qualities of pathogenic bacteria underlie the means by which they cause disease:
1. Invasiveness is the ability to invade tissues. It encompasses mechanisms for colonization (adherence and initial multiplication), production of extracellular substances which facilitate invasion (invasins) and ability to bypass or overcome host defense mechanisms.

2. Toxigenesis is the ability to produce toxins. Bacteria may produce two types of toxins called exotoxins and endotoxins. Exotoxins are released from bacterial cells and may act at tissue sites removed from the site of bacterial growth. Endotoxins are cell-associated substance. (In a classic sense, the term endotoxin refers to the lipopolysaccharide component of the outer membrane of Gram-negative bacteria). However, endotoxins may be released from growing bacterial cells and cells that are lysed as a result of effective host defense (e.g. lysozyme) or the activities of certain antibiotics (e.g. penicillins and cephalosporins). Hence, bacterial toxins, both soluble and cell-associated, may be transported by blood and lymph and cause cytotoxic effects at tissue sites remote from the original point of invasion or growth. Some bacterial toxins may also act at the site of colonization and play a role in invasion. Acid-fast stain of Mycobacterium tuberculosis, the agent of tuberculosis (TB). The bacteria are the small pink-staining rods. More than one-third of the world population is infected. The organism has caused more human deaths than any other bacterium in the history of mankind. Although its ability to produce disease is multifactorial, it is not completely understood. American Society of Microbiology, with permission.
6 0
2 years ago
If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? A. 5 grams B. 10 g
tatiyna
60 years is three half life for the substance, so 40*1/2^3=5
6 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following pairs of terms could be used to describe a bullfrog that is active at night and enters a state of complet
    13·2 answers
  • How do fossils tell us about Earths history
    7·1 answer
  • In the soybean experiment, the ___________ used
    8·1 answer
  • A gas can be squeezed into a smaller container, but a liquid cannot. What does this suggest about the arrangement of particles i
    5·1 answer
  • How does this research relate to human evolution? In other words, what can we learn about human evolution from research along th
    15·1 answer
  • Which regions of the vascular bed is the actual site of gas exchange with surrounding tissue?
    11·2 answers
  • Which one is more important the prokaryotic cell or eukaryotic cell
    14·1 answer
  • Which type of white blood cells produces defensive proteins called antibodies?
    11·1 answer
  • What trait enables an organism to keep its internal body temperature constant?
    14·2 answers
  • 4.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!