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
Anit [1.1K]
3 years ago
15

During the _________ period, the first vertebrates appeared on Earth.

Biology
2 answers:
Dmitrij [34]3 years ago
8 0
C is your answer
hope this helps
natita [175]3 years ago
4 0
Hello,

Your brainliest answer would be:

D. Devonian

Plz mark me brainliest!

Hope this helps!
You might be interested in
Why are enzymes known as biocatalysts?
astraxan [27]
<span>Enzymes are called biocatalysts because they function in chemical reactions that involve living organisms [biologial organisms]. Enzymes generally increase the rate of metabolic reactions by lowering the activation energy, making it easier for the reaction to occur easily and rapidly. Without enzymes, some metabolic reactions may take a very long time before they are completed. Enzymes used in laboratory chemical reactions are not biocatalysts because they are not catalysing reactions in biological organisms. </span>
6 0
3 years ago
What is the main reason that physical geographers might adapt tools from other disciplines such as geology, biology, hydrology,
oksano4ka [1.4K]
Physical Geography is a sub-train of two significantly bigger fields of study - Geography and Earth Sciences. The primary reason for Physical Geography is to clarify the spatial attributes of the different common wonders related with the Earth's hydrosphere, biosphere, climate, and lithosphere
5 0
4 years ago
the condition marfan syndrome results from the production of abnormal elastin, the main component of elstic fibers. predict the
valina [46]

Protein elastin is used to made elastic fiber, component of connective tissue that found abundant in blood vessels, bones, tendon and skin. The effect should be prominent in those organs.

Aorta is the biggest artery blood vessels and it need more elasticity to withstand the pressure of the ventricle. Less elasticity makes aorta become enlarged. The bone will lose density and become thinner. The tendon in heart valve will be weaken and might cause the heart valve disease. The skin will lose elasticity, so it will be easier to stretch.

5 0
3 years ago
Read 2 more answers
Photosynthesis is the process by which plants and algae use energy from the sun to synthesize which of the following?
Softa [21]

Photosynthesis takes within the CO2 produced by all breathing organisms and reintroduces oxygen into the atmosphere. Photosynthesis is that the process employed by plants, algae and certain bacteria to harness energy from sunlight and switch it into energy

5 0
3 years ago
A thick black cloth that forms a barrier to weeds and holds down erosion is called ?
Ipatiy [6.2K]

Answer:

Landscape fabric, weed barrier and weed barrier fabric are names for the same product. It is a black mesh type of plastic that is used extensively in landscaping to keep weeds out of your garden.

8 0
3 years ago
Read 2 more answers
Other questions:
  • What are the components of adenosine triphosphate (ATP)?
    15·2 answers
  • A high school student starts vomiting and goes to the school nurse. the student asks the nurse what part of his brain makes him
    14·2 answers
  • What evidence supports the common ancestory of humans and chimpanzees ?
    6·2 answers
  • The space between two neurons or between a neuron and a receptor organ is known as a __________.
    12·1 answer
  • What is a mutation in biology
    7·1 answer
  • A genetically modified cow is given a gene which allows it produce
    7·1 answer
  • In some areas foresters plant one tree for every tree they cut this activity is an example of
    7·1 answer
  • In an animal, which part of the cell is responsible for keeping viruses out?
    9·1 answer
  • Help please, will give brainly-
    10·1 answer
  • How does your body respond to an increase in the waste products of energy production
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!