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weqwewe [10]
3 years ago
14

Pleaseee help ill mark brainliest!!!

Biology
1 answer:
Marina86 [1]3 years ago
4 0

Answer:

its D aka the last one

Explanation:

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Why do you think animals and amoebas can't do photosynthesis?
Virty [35]

Answer:

they lack chloroplats

Explanation:

chloroplasts are the base of photosynthesis

6 0
3 years ago
A plant with round seeds is crossed with a plant with wrinkled seeds. Draw a Punnett square to predict the outcome
astraxan [27]

Answer:

Explanation:

A cross between plants with round seeds (RR) and plants with wrinkled seeds (rr).  If both parents are homozygous, having one type of gamete each, i.e. R from round seed parent and r from wrinkled seed parent (RR X rr).

    R     R

r   Rr     Rr

r   Rr     Rr

All the offspring of generation would be round with genetic constitution Rr. They will be heterozygous plants having two different alleles.  

If both parents has heterozygous round seeds with genotype Rr. So, we have Rr × Rr. The gametes produced from each of the parents are of two types, R and r.

   

     R      r

R    RR    Rr

r     Rr      rr

The generation has a genotypic ratio of 1 RR : 2 Rr : 1 rr. The phenotypic ratio is 3 round : 1 wrinkled.

5 0
4 years ago
What is the definition of absolute dating​
OverLord2011 [107]

Answer:

Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.

8 0
3 years ago
a scientist wants to use asexually reproducing vegtables to increase crop yeilds. he plans to destribute budding potatoes and te
ale4655 [162]
<span>benefits- 
huge yield 
it going to be faster to propagate 
risks-
no genetic diversity so if a virus comes around everything will die 
wouldn't be able to grow in other palaces 
price would go down because there are so many


I hope this helps!</span>
6 0
3 years ago
Why are multiple action potentials generated in response to a long stimulus that is above threshold?
leva [86]

Solution: The rapid rise and fall in the membrane potential across a cell's membrane is known as action potential. The generation of the action potential is necessary for the transfer of the nerve impulses across the neurons. The nerve impulses are generated only when the cell membrane is depolarized to its threshold level. These potentials are generate din response to different stimuli. When this stimulus is long, the recovery time is increased and the action potentials are allowed to occur after the relative refractory period above the threshold. (A refractory period can be defined as the time during which no action potential can be generated.)

This causes the generation of the multiple action potentials.

5 0
4 years ago
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