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schepotkina [342]
3 years ago
13

Help!! Please. I need it!!

Biology
1 answer:
katovenus [111]3 years ago
6 0
Enzymes can be destroyed by variations in temperature or pH
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A meteorite is determined to be 4.5 billion years old. It now has 78 atoms of lead-206. Assuming no loss of daughter isotopes, h
vovangra [49]
Given the age of the meteorite is 4.5 billion years old with 78 atoms of lead-206 the answer should be B. 156. The half-life of uranium-238 in order to decay into lead-206 is 4.46 billion years, which means that the original number of atoms is 156.  
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3 years ago
What is the structure of hemoglobin and how is oxygen bound to it?
Rasek [7]

Hemoglobin has tetrahedral structure containing four heme groups that surround a globin group.

Heme is ringlike organic compound also known as a porphyrin to which an iron atom is attached. There are four iron atoms that bind four oxygen atoms and transport them to tissues.


8 0
3 years ago
True / False. Biologists classify specific forms of traits as good or bad. For example, long tails in cats could be classified a
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Answer: False

Explanation:

Some organisms have an advantage with some traits, but they could be a disadvantage in other situations.

4 0
3 years ago
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Water can act as either a(n) _____ or a _____. acid, base solute, solvent anion, cation salt, mixture
IgorC [24]
Water can act as either a base or an acid. Water acts as an acid by donating a hydrogen ion when it reacts with a stronger base such as sodium hydroxide. Water may also act as a base when it accepts hydrogen ion when reacting with a strong acid such as hydrochloric acid. This is based on Bronsted concept and definition of a base ( proton acceptor) and acid (proton donor). Such a  compound that can act as a base and as an acid is called an amphiprotic molecule.
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3 years ago
Which are tunics (layers) that make up the gastrointestinal wall?
AlekseyPX

The gastrointestinal wall is composed of four layers or tunics:

  • Mucosa
  • Submucosa
  • Muscularis mucosa
  • Serosa

The innermost tunic of the wall is known as the mucosa or mucous membrane layer. The digestive tract's lumen is lined with it. The mucosa comprises epithelium, a layer of lamina propria, a loose layer of connective tissue, and the muscularis mucosa, a thin layer of smooth muscle.

The mucosa is surrounded by a substantial layer of loose connective tissue known as the submucosa. Blood arteries, lymphatic vessels, and neurons are also present in this stratum. The adventitia is a connective tissue that makes up the digestive tract's outermost layer above the diaphragm. It is referred to as serosa below the diaphragm.

To learn more about mucosa click here

brainly.com/question/13153021

#SPJ4

3 0
2 years ago
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