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Zielflug [23.3K]
3 years ago
10

Vertebrates developed about 550 million years ago. the oldest vertebrate fossils are those of _____ with no jaws.

Biology
2 answers:
Mekhanik [1.2K]3 years ago
7 0

oldest vertabrate fossils were fish with no jaws

jarptica [38.1K]3 years ago
3 0
Vertebrates developed about 550 million years ago. The oldest vertebrate fossils are those of FISH with no jaws. These e<span>arly jawless fish did not have paired fins and their bodies were covered with heavy, bony scaled, but their skeletons were made of cartilage. For the next 50 million years, they were the only vertebrates.</span>
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30 POINTS!
andrew11 [14]

Answer:

A represents photosynthesis and B represents cellular respiration.

Explanation:

As in A there is utilization of carbon dioxide and water to make oxygen and glucose which is a key process of photosynthesis, and then this oxygen and glucose is used as energy source to produce carbon dioxide and water as by products of respiration.

6 0
3 years ago
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A forest has two groups of plants that appear to be very similar both phenotypically and genotypically. The major difference is
Gennadij [26K]
The basics would be that you'd need to find out if they could exchange genetic information. If not, they couldn't be considered part of one species. Set-up 2 artificial environments so both groups would produce pollen at the same time. Fertilise both plants with the other's pollen. Then fertilise the plants with pollen from their own group. 
Count the number of offspring each plant produces. 
If the plants which were fertilised by the opposite group produce offspring, they are of the same species. You can then take this further if they are of the same species by analysing if there is any difference between the number (and health) of offspring produced by the crossed progeny and by the pure progeny. You'd have to take into account that some of them would want to grow at different times, so a study of the progeny from their first sprout until death (whilst emulating the seasons in your ideal controlled environment). Their success could then be compared to that of the pure-bred individuals. 
Make sure to repeat this a few times, or have a number of plants to make sure your results are accurate. 
Or if you couldn't do the controlled environment thing, just keep some pollen one year and use it to fertilise the other group. 
I'd also put a hypothesis in there somewhere too. 
The independent variable would be the number of plants pollinated. The dependant variable would be the number of progeny (offspring) produced. 
5 0
3 years ago
Please help!!!!!!!! Will mark brianlist ASAP
KiRa [710]

I'm going with C. It may be wrong but I think it's C.

3 0
3 years ago
Read 2 more answers
Please help!!!!!!!!!
schepotkina [342]
This is baby stuff tbh. But it is A. You need water to live. Food to live. Air obviously and a shelter
6 0
3 years ago
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What does photosynthesis form in a leaf first?
prohojiy [21]

the process plants use to produce food is photosynthesis.

the answer is food (food in the presence of starch=sugar) and oxygen.

8 0
2 years ago
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