Answer:
Scientists try to control most variables in an experiment to find a relationship between the independent variable and the dependent variable
1) Their ears: Alpaca ears have short spear-shaped ears while llamas have much longer, banana-shaped ears.
2) Their size: Alpacas generally weigh in at around 150 pounds while llamas can get as heavy as 400 pounds. At the shoulder, an average alpaca stands between 34 and 36 inches, while a llama generally ranges between 42 and 46 inches.
3) Their faces: Llamas have a longer face; an alpaca’s face is a bit more blunt, giving them a “smooshed in” look.
4)Their purpose: For more than 5,000 years alpacas have been bred for fiber (and in Peru for meat as well), while llamas have been bred for the same amount of time as pack animals and meat.
5) Their hair: The alpaca produces a much finer fiber than the llama. The alpaca also produces more fleece than its larger cousin and in a much greater variety of colors. Llamas also generally do not have as much hair on their head and face as alpacas do.
6) Their dispositions: Alpacas are very much herd animals, while llamas are more independent minded. Alpacas also tend to be a bit more skittish than llamas, which are often used as guard animals for alpacas, sheep, and other small livestock.
Answer:
An increase in membrane thickness
Explanation:
Gaseous exchange occurs in relation to Fick's Law which states:
'the rate of diffusion is proportional to both the surface area and concentration difference and is inversely proportional to the thickness of the membrane
Therefore, based on this law, an increase in the thickness of the membrane will result in a decreased diffusion rate which will in turn slow down the process of gaseous exchange
Answer:
А. They belong to the same group of the periodic table.
Explanation:
Two elements possess similar chemical properties if they belong to the same group on the periodic table.
What determines the chemical properties of elements;
→ the number of valence electrons an element contains determines its chemical properties.
- On the periodic table, groups are vertical arrangement of elements.
- Periodic groups classifies elements into groups based on the number of valence electrons they contain.
- So, elements in the same group will have the same number of valence electrons and hence similar chemical properties.