#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long int ll;
typedef long double ld;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<vvvi> vvvvi;
typedef pair<ll,ll> pi;
typedef pair<ll,pi> ppi;
typedef pair<ll,ppi> pppi;
typedef pair<ll,pppi> ppppi;
#define FOR(i,l,r) for(ll i=l;i<r;i++)
#define REP(i,n) FOR(i,0,n)
#define RFOR(i,l,r) for(ll i=r-1;i>=l;i--)
#define RREP(i,n) RFOR(i,0,n)
#define ALL(x) x.begin(),x.end()
#define F first
#define S second
#define BS(A,x) binary_search(ALL(A),x)
#define LB(A,x) (ll)(lower_bound(ALL(A),x)-A.begin())
#define UB(A,x) (ll)(upper_bound(ALL(A),x)-A.begin())
#define COU(A,x) (UB(A,x)-LB(A,x))
#define sz(c) ((ll)(c).size())
/*
#include<boost/multiprecision/cpp_int.hpp>
namespace mp=boost::multiprecision;
using Bint=mp::cpp_int;
*/
template<typename T>using min_priority_queue=priority_queue<T,vector<T>,greater<T>>;
template<typename T1,typename T2>ostream&operator<<(ostream&os,pair<T1,T2>&p){os<<p.F<<" "<<p.S;return os;}
template<typename T1,typename T2>istream&operator>>(istream&is,pair<T1,T2>&p){is>>p.F>>p.S;return is;}
template<typename T>ostream&operator<<(ostream&os,vector<T>&v){REP(i,sz(v))os<<v[i]<<(i+1!=sz(v)?" ":"");return os;}
template<typename T>istream&operator>>(istream&is,vector<T>&v){for(T&in:v)is>>in;return is;}
template<class T>bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T&a,T b){if(b<a){a=b;return 1;}return 0;}
ld dist(ld x1,ld y1,ld x2,ld y2){return sqrtl((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}
//*
using mint=modint998244353;
const ll mod=998244353;
const ld EPS=1e-8;
//*/
/*
using mint=modint1000000007;
const ll mod=1000000007;
//*/
//using mint=modint;
//*
typedef vector<mint> vm;
typedef vector<vm> vvm;
typedef vector<vvm> vvvm;
typedef vector<vvvm> vvvvm;
ostream&operator<<(ostream&os,mint&a){os<<a.val();return os;}
//*/
vvi E(2e5),T(20,vi(2e5));
vi P(2e5,-1),D(2e5),S(2e5,1);
void dfs(ll v){
	for(auto u:E[v])if(P[u]==-1){
		P[u]=v;
		D[u]=D[v]+1;
		dfs(u);
		S[v]+=S[u];
	}
}
ll up(ll v,ll d){
	if(d>2e5)return 0;
	REP(i,20)if((d>>i)%2)v=T[i][v];
	return v;
}
ll lca(ll u,ll v){
	if(D[u]>D[v])swap(u,v);
	v=up(v,D[v]-D[u]);
	ll l=-1,r=D[v];
	while(r-l>1){
		ll m=(l+r)/2;
		if(up(v,m)==up(u,m))r=m;
		else l=m;
	}
	return up(u,r);
}
int main(){
  ll N,_;cin>>N>>_;
  REP(i,N-1){
  	ll u,v;cin>>u>>v;u--;v--;
  	E[u].emplace_back(v);
  	E[v].emplace_back(u);
  }
  P[0]=0;
  dfs(0);
  T[0]=P;
  FOR(i,1,20)REP(v,N)T[i][v]=T[i-1][T[i-1][v]];
  while(_--){
  	ll s,t;cin>>s>>t;s--;t--;
  	if((D[s]-D[t])%2){cout<<0<<endl;continue;}
  	ll u=lca(s,t);
  	if(D[s]==D[t]){
  		ll d=D[s]-D[u];
  		ll _s=up(s,d-1);
  		ll _t=up(t,d-1);
  		cout<<N-S[_s]-S[_t]<<endl;
  		continue;
  	}
  	
  }
  return 0;
}