One way to remove dirt and harmful substances from water is by filtering.
Answer:
Nucleus and acrosome
Explanation:
Human sperm is the male gamete or sex cell formed by spermatogenesis. It is made of a head, neck, a middle piece and a tail. The sperm head consists of a haploid nucleus and anterior to nucleus, an acrosome. The nucleus contains DNA and nuclear protein and it transfers genetic features from the male to the next generation. The acrosome contains an important enzymes, hyaluronidase and acrosin. These enzymes help to enter head into an ovum.
Answer:
Answer A or B
Explanation: I say its a or b because if your in biology then this would mostly likely be your answer. Also when for one two daughter cells would usually go for sperm and egg cells but at the same time binary fission can be used for making for bacteria. If it were me i would choose B, but test your luck.
Answer:
The idea of spontaneous generation was disproved by Francesco Redi.
Explanation:
- Spontaneous generation is a theory that states that living organism can generate from an inanimate object.
- In, 1668, Francesco Redi demonstrate an experiment explaining the theory of spontaneous generation by using meat.He noticed that flies laid eggs on meat which was kept open and maggots developed.
- He took three pieces of meat to do the experiment.
- The first piece of meat was kept open and as usual maggot development takes place.
- With the 2nd piece of meat,he covered it with a piece of cheesecloth and noticed that,flies lay eggs on the cheesecloth but when he removed the cloth,maggot did't form.
- Next, he took a piece of paper and cover the meat piece, and he noticed that flies did't lay any eggs and thus no maggots formed.
Answer:
B) hypertension and bradycardia.
Explanation:
Autonomic dysreflexia is a syndrome which is characterised by the sudden rise in the blood pressure of the human. The disease is common in the people with a higher level of spinal cord injuries above the T6 level.
The condition occurs when some external stimuli like pain or irritant activate the involuntary response in the body which cause the blood pressure to rise (hypertension). This leads to the slowdown of the heartbeat (bradycardia) to restore the blood pressure but the body cannot restore the blood pressure due to the damage in the spinal cord.
Thus, Option-B is the correct answer.
