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Que penses-tu des problèmes concernant la planète?

Je pense que le réchauffement climatique est un vrai problème pour la Terre. Nous devrions essayer de réduire les émissions de dioxide de carbone en utilisant les transports en commun au lieu de dépendre sur...
PR
Answered by Prune R. • French tutor
2765 Views

Explain the transmission of nerve impulses across a cholinergic synapse

When an action potential arrives at the pre-synaptic neurone, it causes a change in voltage due to the presence of positive Na ions. This causes voltage-gated Ca 2+ protein channels to open and allow calcium...
KS
Answered by Kimran S. • Biology tutor
5133 Views

Describe the structure and function of the cytoskeleton

An organelle found in all eukaryotic cells made of thin microfilaments of the protein actin and microtubules made of the protein tubulin. Transport is the key role where motor proteins drag organelles from o...
SL
Answered by Sakina L. • Biology tutor
9322 Views

Explain how guard cells are specialised for their specific function

Guard cells open and close the stomata in a leaf. When the plant has lots of water the guard cells fill with it and become plump and turgid. This makes the stomata open so gases can be exchanged for photosyn...
GK
Answered by Grace K. • Biology tutor
18364 Views

Solve the simultaneous equations 3x + y = 23 and 4x + 4y = 52

3x + y =23, 4x +4y=5212x+4y=92, 12x+12y=1568y=64y=8sub in3x+8=23, 3x=15x=5y=8x=5
SB
Answered by Samuel B. • Maths tutor
3692 Views